diff --git a/src/Controller/ProjectController.php b/src/Controller/ProjectController.php
index 88db3ddf..b1c31edb 100644
--- a/src/Controller/ProjectController.php
+++ b/src/Controller/ProjectController.php
@@ -76,7 +76,7 @@ class ProjectController extends AbstractController
     /**
      * @Route("/{id}/build", name="project_build", requirements={"id"="\d+"})
      */
-    public function build(Project $project, Request $request, ProjectBuildHelper $buildHelper): Response
+    public function build(Project $project, Request $request, ProjectBuildHelper $buildHelper, EntityManagerInterface $entityManager): Response
     {
         $this->denyAccessUnlessGranted('read', $project);
 
@@ -90,8 +90,19 @@ class ProjectController extends AbstractController
         $form = $this->createForm(ProjectBuildType::class, $projectBuildRequest);
 
         $form->handleRequest($request);
-        if ($form->isSubmitted() && $form->isValid()) {
-            dump($projectBuildRequest);
+        if ($form->isSubmitted()) {
+            if ($form->isValid()) {
+                $buildHelper->doWithdrawForProjectBuildRequest($projectBuildRequest);
+                $entityManager->flush();
+                $this->addFlash('success', 'project.build.flash.success');
+
+                return $this->redirect(
+                    $request->get('_redirect',
+                        $this->generateUrl('project_info', ['id' => $project->getID()]
+                        )));
+            } else {
+                $this->addFlash('error', 'project.build.flash.invalid_input');
+            }
         }
 
         return $this->renderForm('Projects/build/build.html.twig', [
diff --git a/src/Form/ProjectSystem/ProjectBuildType.php b/src/Form/ProjectSystem/ProjectBuildType.php
index c56c413d..dbd717f3 100644
--- a/src/Form/ProjectSystem/ProjectBuildType.php
+++ b/src/Form/ProjectSystem/ProjectBuildType.php
@@ -26,6 +26,7 @@ use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\DataMapperInterface;
 use Symfony\Component\Form\Event\PreSetDataEvent;
 use Symfony\Component\Form\Extension\Core\Type\SubmitType;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\FormInterface;
@@ -47,6 +48,12 @@ class ProjectBuildType extends AbstractType implements DataMapperInterface
 
         $builder->add('submit', SubmitType::class, []);
 
+        $builder->add('comment', TextType::class, [
+            'label' => 'part.info.withdraw_modal.comment',
+            'help' => 'part.info.withdraw_modal.comment.hint',
+            'required' => false,
+        ]);
+
         //The form is initially empty, we have to define the fields after we know the data
         $builder->addEventListener(FormEvents::PRE_SET_DATA, function (PreSetDataEvent $event) {
             $form = $event->getForm();
diff --git a/src/Helpers/Projects/ProjectBuildRequest.php b/src/Helpers/Projects/ProjectBuildRequest.php
index 4097dbad..8cf94063 100644
--- a/src/Helpers/Projects/ProjectBuildRequest.php
+++ b/src/Helpers/Projects/ProjectBuildRequest.php
@@ -38,6 +38,8 @@ final class ProjectBuildRequest
      */
     private array $withdraw_amounts = [];
 
+    private string $comment = '';
+
     /**
      * @param  Project  $project  The project that should be build
      * @param  int  $number_of_builds The number of builds that should be created
@@ -78,6 +80,24 @@ final class ProjectBuildRequest
         }
     }
 
+    /**
+     * Returns the comment where the user can write additional information about the build.
+     * @return string
+     */
+    public function getComment(): string
+    {
+        return $this->comment;
+    }
+
+    /**
+     * Sets the comment where the user can write additional information about the build.
+     * @param  string  $comment
+     */
+    public function setComment(string $comment): void
+    {
+        $this->comment = $comment;
+    }
+
     /**
      * Returns the amount of parts that should be withdrawn from the given lot for the corresponding BOM entry.
      * @param PartLot|int $lot The part lot (or the ID of the part lot) for which the withdraw amount should be get
diff --git a/src/Services/ProjectSystem/ProjectBuildHelper.php b/src/Services/ProjectSystem/ProjectBuildHelper.php
index 33a8bc4d..73825f98 100644
--- a/src/Services/ProjectSystem/ProjectBuildHelper.php
+++ b/src/Services/ProjectSystem/ProjectBuildHelper.php
@@ -22,9 +22,17 @@ namespace App\Services\ProjectSystem;
 
 use App\Entity\ProjectSystem\Project;
 use App\Entity\ProjectSystem\ProjectBOMEntry;
+use App\Helpers\Projects\ProjectBuildRequest;
+use App\Services\Parts\PartLotWithdrawAddHelper;
 
 class ProjectBuildHelper
 {
+    private PartLotWithdrawAddHelper $withdraw_add_helper;
+
+    public function __construct(PartLotWithdrawAddHelper $withdraw_add_helper)
+    {
+        $this->withdraw_add_helper = $withdraw_add_helper;
+    }
 
     /**
      * Returns the maximum buildable amount of the given BOM entry based on the stock of the used parts.
@@ -125,4 +133,26 @@ class ProjectBuildHelper
 
         return $non_buildable_entries;
     }
+
+    /**
+     * Withdraw the parts from the stock using the given ProjectBuildRequest.
+     * The ProjectBuildRequest has to be validated before!!
+     * You have to flush changes to DB afterwards
+     * @param  ProjectBuildRequest  $buildRequest
+     * @return void
+     */
+    public function doWithdrawForProjectBuildRequest(ProjectBuildRequest $buildRequest): void
+    {
+        $message = $buildRequest->getComment();
+        $message .= ' (Project build: '.$buildRequest->getProject()->getName().')';
+
+        foreach ($buildRequest->getBomEntries() as $bom_entry) {
+            foreach ($buildRequest->getPartLotsForBOMEntry($bom_entry) as $part_lot) {
+                $amount = $buildRequest->getLotWithdrawAmount($part_lot);
+                if ($amount > 0) {
+                    $this->withdraw_add_helper->withdraw($part_lot, $amount, $message);
+                }
+            }
+        }
+    }
 }
\ No newline at end of file
diff --git a/templates/Projects/build/_form.html.twig b/templates/Projects/build/_form.html.twig
index a0139643..827c7474 100644
--- a/templates/Projects/build/_form.html.twig
+++ b/templates/Projects/build/_form.html.twig
@@ -57,6 +57,8 @@
     </tbody>
 </table>
 
+{{ form_row(form.comment) }}
+
 {{ form_row(form.submit) }}
 
 {{ form_end(form) }}
\ No newline at end of file
diff --git a/translations/messages.en.xlf b/translations/messages.en.xlf
index f75b5b92..7de39995 100644
--- a/translations/messages.en.xlf
+++ b/translations/messages.en.xlf
@@ -10345,5 +10345,11 @@ Element 3</target>
         <target>You do not have enough parts stocked to build this project %number_of_builds% times. The following parts have missing instock:</target>
       </segment>
     </unit>
+    <unit id="dB.JmYm" name="project.build.flash.invalid_input">
+      <segment>
+        <source>project.build.flash.invalid_input</source>
+        <target>Can not build project. Check input!</target>
+      </segment>
+    </unit>
   </file>
 </xliff>