diff --git a/assets/js/app.js b/assets/js/app.js
index 2512594c..8d4448c6 100644
--- a/assets/js/app.js
+++ b/assets/js/app.js
@@ -20,6 +20,7 @@ import 'datatables.net-bs4/css/dataTables.bootstrap4.css'
 import 'datatables.net-buttons-bs4/css/buttons.bootstrap4.css'
 import 'datatables.net-fixedheader-bs4/css/fixedHeader.bootstrap4.css'
 import 'datatables.net-select-bs4/css/select.bootstrap4.css'
+import 'bootstrap-select/dist/css/bootstrap-select.css'
 
 //require( 'jszip' );
 //#require( 'pdfmake' );
@@ -31,6 +32,7 @@ require( 'datatables.net-buttons/js/buttons.print.js' );
 //require( 'datatables.net-colreorder-bs4' )();
 require( 'datatables.net-fixedheader-bs4' );
 require( 'datatables.net-select-bs4' );
+require('bootstrap-select')
 
 
 //Define jquery globally
diff --git a/package.json b/package.json
index a3302a33..16148b9d 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     },
     "dependencies": {
         "@ckeditor/ckeditor5-build-classic": "^12.0.0",
+        "bootstrap-select": "1.13.5",
         "datatables.net-bs4": "^1.10.19",
         "datatables.net-buttons-bs4": "^1.5.4",
         "datatables.net-fixedheader-bs4": "^3.1.5",
diff --git a/src/Entity/Part.php b/src/Entity/Part.php
index 19d3ca9e..0d5fc836 100644
--- a/src/Entity/Part.php
+++ b/src/Entity/Part.php
@@ -322,24 +322,24 @@ class Part extends AttachmentContainingDBElement
 
         /**
         if ($with_devices) {
-            $count_must_order = 0;      // for devices with "order_only_missing_parts == false"
-            $count_should_order = 0;    // for devices with "order_only_missing_parts == true"
-            $deviceparts = DevicePart::getOrderDeviceParts($this->database, $this->current_user, $this->log, $this->getID());
-            foreach ($deviceparts as $devicepart) {
-                /** @var $devicepart DevicePart */
-                /** @var $device Device */ /**
-                $device = $devicepart->getDevice();
-                if ($device->getOrderOnlyMissingParts()) {
-                    $count_should_order += $device->getOrderQuantity() * $devicepart->getMountQuantity();
-                } else {
-                    $count_must_order += $device->getOrderQuantity() * $devicepart->getMountQuantity();
-                }
-            }
+        $count_must_order = 0;      // for devices with "order_only_missing_parts == false"
+        $count_should_order = 0;    // for devices with "order_only_missing_parts == true"
+        $deviceparts = DevicePart::getOrderDeviceParts($this->database, $this->current_user, $this->log, $this->getID());
+        foreach ($deviceparts as $devicepart) {
+        /** @var $devicepart DevicePart */
+        /** @var $device Device */ /**
+    $device = $devicepart->getDevice();
+    if ($device->getOrderOnlyMissingParts()) {
+    $count_should_order += $device->getOrderQuantity() * $devicepart->getMountQuantity();
+    } else {
+    $count_must_order += $device->getOrderQuantity() * $devicepart->getMountQuantity();
+    }
+    }
 
-            return $count_must_order + max(0, $this->getMinInstock() - $this->getInstock() + $count_should_order);
-        } else {
-            return max(0, $this->getMinInstock() - $this->getInstock());
-        } **/
+    return $count_must_order + max(0, $this->getMinInstock() - $this->getInstock() + $count_should_order);
+    } else {
+    return max(0, $this->getMinInstock() - $this->getInstock());
+    } **/
     }
 
     /**
@@ -993,70 +993,61 @@ class Part extends AttachmentContainingDBElement
     }
 
     /**
-     *  Set the ID of the category
+     *  Set the category of this Part
      *
      *     Every part must have a valid category (in contrast to the
      *          attributes "footprint", "storelocation", ...)!
      *
-     * @param integer $new_category_id       the ID of the category
+     * @param  Category $category       The new category of this part
      *
      * @return self
      */
     public function setCategory(Category $category) : self
     {
-        //TODO
         $this->category = $category;
 
         return $this;
     }
 
     /**
-     *  Set the footprint ID
+     * Set the new Footprint of this Part.
      *
-     * @param integer|NULL $new_footprint_id    * the ID of the footprint
-     *                                          * NULL means "no footprint"
-     *
-     * @throws Exception if the new footprint ID is not valid
-     * @throws Exception if there was an error
+     * @param Footprint|null $new_footprint The new footprint of this part. Set to null, if this part should not have
+     * a footprint.
+     * @return self
      */
-    public function setFootprintID($new_footprint_id) : self
+    public function setFootprint(?Footprint $new_footprint) : self
     {
-        //TODO
-        throw new \Exception("Not implemented yet!");
+        $this->footprint = $new_footprint;
+
+        return $this;
+    }
+
+
+    /**
+     * Set the new store location of this part.
+     *
+     * @param Storelocation|null $new_storelocation The new Storelocation of this part. Set to null, if this part should
+     * not have a storelocation.
+     * @return Part
+     */
+    public function setStorelocation(?Storelocation $new_storelocation) : self
+    {
+        $this->storelocation = $new_storelocation;
 
         return $this;
     }
 
     /**
-     *  Set the storelocation ID
+     * Sets the new manufacturer of this part.
      *
-     * @param integer|NULL $new_storelocation_id    * the ID of the storelocation
-     *                                              * NULL means "no storelocation"
-     *
-     * @throws Exception if the new storelocation ID is not valid
-     * @throws Exception if there was an error
+     * @param Manufacturer|null $new_manufacturer The new Manufacturer of this part. Set to null, if this part should
+     * not have a manufacturer.
+     * @return Part
      */
-    public function setStorelocationID($new_storelocation_id) : self
+    public function setManufacturer(?Manufacturer $new_manufacturer) : self
     {
-        //TODO
-        throw new \Exception("Not implemented yet!");
-
-        return $this;
-    }
-
-    /**
-     *  Set the manufacturer ID
-     *
-     * @param integer|NULL $new_manufacturer_id     * the ID of the manufacturer
-     *                                              * NULL means "no manufacturer"
-     *
-     * @throws Exception if the new manufacturer ID is not valid
-     * @throws Exception if there was an error
-     */
-    public function setManufacturerID($new_manufacturer_id) : self
-    {
-        //TODO
-        throw new \Exception("Not implemented yet!");
+        $this->manufacturer = $new_manufacturer;
 
         return $this;
     }
diff --git a/src/Form/PartType.php b/src/Form/PartType.php
index ff1ed8a7..5debee07 100644
--- a/src/Form/PartType.php
+++ b/src/Form/PartType.php
@@ -32,8 +32,12 @@
 namespace App\Form;
 
 
+use App\Entity\Category;
+use App\Entity\Manufacturer;
 use App\Entity\Part;
+use App\Entity\Storelocation;
 use FOS\CKEditorBundle\Form\Type\CKEditorType;
+use Symfony\Bridge\Doctrine\Form\Type\EntityType;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\Extension\Core\Type\TextareaType;
 use Symfony\Component\Form\Extension\Core\Type\UrlType;
@@ -57,6 +61,12 @@ class PartType extends AbstractType
                 ['attr' => ['min'=>0, 'placeholder' => 'part.instock.placeholder'], 'label'=> 'instock.label'])
             ->add('mininstock', IntegerType::class,
                 ['attr' => ['min'=>0, 'placeholder' => 'part.mininstock.placeholder'], 'label'=> 'mininstock.label'])
+            ->add('category', EntityType::class, ['class' => Category::class, 'choice_label' => 'full_path',
+                'attr' => ['class' => 'selectpicker', 'data-live-search' => true, 'label'=> 'category.label']])
+            ->add('storelocation', EntityType::class, ['class' => Storelocation::class, 'choice_label' => 'full_path',
+                'attr' => ['class' => 'selectpicker', 'data-live-search' => true], 'required' => false, 'label'=> 'storelocation.label'])
+            ->add('manufacturer', EntityType::class, ['class' => Manufacturer::class, 'choice_label' => 'full_path',
+                'attr' => ['class' => 'selectpicker', 'data-live-search' => true], 'required' => false, 'label'=> 'manufacturer.label'])
             ->add('manufacturer_product_url', UrlType::class, ['required'=>false, 'empty_data' => '',
                 'label'=> 'manufacturer_url.label'])
             ->add('comment', CKEditorType::class, ['required'=>false,
diff --git a/yarn.lock b/yarn.lock
index f395b610..8f2384b8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1186,6 +1186,11 @@ boolbase@^1.0.0, boolbase@~1.0.0:
   resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
   integrity sha1-aN/1++YMUes3cl6p4+0xDcwed24=
 
+bootstrap-select@1.13.5:
+  version "1.13.5"
+  resolved "https://registry.yarnpkg.com/bootstrap-select/-/bootstrap-select-1.13.5.tgz#12f000b25a95ed642fe371ae9e311d3afbb8c53f"
+  integrity sha512-1uYsYLB4FvGdwM6qzIfTxp6sP5gDqjPgWNHJztBfYUTIo1GUYG5zzmMVWiJvdxJlsvBXZ9AObmeZdzi0eg2jaA==
+
 bootstrap@^4.3.1:
   version "4.3.1"
   resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.3.1.tgz#280ca8f610504d99d7b6b4bfc4b68cec601704ac"