diff --git a/src/AppBundle/Manager/BaseManager.php b/src/AppBundle/Manager/BaseManager.php
new file mode 100644
index 0000000..cfeb49c
--- /dev/null
+++ b/src/AppBundle/Manager/BaseManager.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace AppBundle\Manager;
+
+class BaseManager
+{
+    protected $repository;
+
+    /**
+     * @return mixed
+     */
+    public function getRepository()
+    {
+        return $this->repository;
+    }
+}
diff --git a/src/AppBundle/Manager/LDraw/CategoryManager.php b/src/AppBundle/Manager/LDraw/CategoryManager.php
new file mode 100644
index 0000000..7df6d71
--- /dev/null
+++ b/src/AppBundle/Manager/LDraw/CategoryManager.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace AppBundle\Manager\LDraw;
+
+use AppBundle\Entity\LDraw\Category;
+use AppBundle\Manager\BaseManager;
+use AppBundle\Repository\LDraw\CategoryRepository;
+
+class CategoryManager extends BaseManager
+{
+    /**
+     * CategoryManager constructor.
+     *
+     * @param CategoryRepository $repository
+     */
+    public function __construct(CategoryRepository $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    public function findAll()
+    {
+        return $this->repository->findAll();
+    }
+
+    /**
+     * Create new Category entity with $name or retrieve one.
+     *
+     * @param $name
+     *
+     * @return Category
+     */
+    public function create($name)
+    {
+        if (($category = $this->repository->findByName($name)) == null) {
+            $category = new Category();
+            $category->setName($name);
+        }
+
+        return $category;
+    }
+}
diff --git a/src/AppBundle/Manager/LDraw/KeywordManager.php b/src/AppBundle/Manager/LDraw/KeywordManager.php
new file mode 100644
index 0000000..a321708
--- /dev/null
+++ b/src/AppBundle/Manager/LDraw/KeywordManager.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace AppBundle\Manager\LDraw;
+
+use AppBundle\Entity\LDraw\Keyword;
+use AppBundle\Manager\BaseManager;
+use AppBundle\Repository\LDraw\KeywordRepository;
+
+class KeywordManager extends BaseManager
+{
+    /**
+     * KeywordManager constructor.
+     *
+     * @param KeywordRepository $repository
+     */
+    public function __construct(KeywordRepository $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    /**
+     * Create new Keyword entity with $name or retrieve one.
+     *
+     * @param $name
+     *
+     * @return Keyword
+     */
+    public function create($name)
+    {
+        if (($keyword = $this->repository->findByName($name)) == null) {
+            $keyword = new Keyword();
+            $keyword->setName($name);
+        }
+
+        return $keyword;
+    }
+}
diff --git a/src/AppBundle/Manager/LDraw/ModelManager.php b/src/AppBundle/Manager/LDraw/ModelManager.php
new file mode 100644
index 0000000..1d1e6cc
--- /dev/null
+++ b/src/AppBundle/Manager/LDraw/ModelManager.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace AppBundle\Manager\LDraw;
+
+use AppBundle\Entity\LDraw\Model;
+use AppBundle\Manager\BaseManager;
+use AppBundle\Repository\LDraw\ModelRepository;
+
+class ModelManager extends BaseManager
+{
+    /**
+     * ModelManager constructor.
+     *
+     * @param ModelRepository $repository
+     */
+    public function __construct(ModelRepository $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    /**
+     * Create new Model entity with $number or retrieve one.
+     *
+     * @param $number
+     *
+     * @return Model
+     */
+    public function create($number)
+    {
+        if (($model = $this->repository->find($number)) == null) {
+            $model = new Model();
+            $model->setNumber($number);
+        }
+
+        return $model;
+    }
+}
diff --git a/src/AppBundle/Manager/LDraw/PartManager.php b/src/AppBundle/Manager/LDraw/PartManager.php
new file mode 100644
index 0000000..a25e8ac
--- /dev/null
+++ b/src/AppBundle/Manager/LDraw/PartManager.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace AppBundle\Manager\LDraw;
+
+use AppBundle\Entity\LDraw\Part;
+use AppBundle\Manager\BaseManager;
+use AppBundle\Repository\LDraw\CategoryRepository;
+use AppBundle\Repository\LDraw\PartRepository;
+
+class PartManager extends BaseManager
+{
+    /**
+     * PartManager constructor.
+     *
+     * @param CategoryRepository $repository
+     */
+    public function __construct(PartRepository $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    /**
+     * Create new Part entity with $number or retrieve one.
+     *
+     * @param $number
+     *
+     * @return Part
+     */
+    public function create($number)
+    {
+        if (($part = $this->repository->find($number)) == null) {
+            $part = new Part();
+            $part->setNumber($number);
+        }
+
+        return $part;
+    }
+}
diff --git a/src/AppBundle/Manager/LDraw/Part_RelationManager.php b/src/AppBundle/Manager/LDraw/Part_RelationManager.php
new file mode 100644
index 0000000..d6e9fbd
--- /dev/null
+++ b/src/AppBundle/Manager/LDraw/Part_RelationManager.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace AppBundle\Manager\LDraw;
+
+use AppBundle\Entity\LDraw\Part_Relation;
+use AppBundle\Manager\BaseManager;
+use AppBundle\Repository\LDraw\Part_RelationRepository;
+
+class Part_RelationManager extends BaseManager
+{
+    /**
+     * Part_RelationManager constructor.
+     *
+     * @param Part_RelationRepository $repository
+     */
+    public function __construct(Part_RelationRepository $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    /**
+     * Create new Keyword entity with $name or retrieve one.
+     *
+     * @param $name
+     *
+     * @return Part_Relation
+     */
+    public function create($parent, $child, $relationType)
+    {
+        if (($partRelation = $this->repository->findByForeignKeys($parent, $child, $relationType)) == null) {
+            $partRelation = new Part_Relation();
+            $partRelation
+                ->setParent($parent)
+                ->setChild($child)
+                ->setCount(0)
+                ->setType($relationType);
+        }
+
+        return $partRelation;
+    }
+}
diff --git a/src/AppBundle/Manager/LDraw/TypeManager.php b/src/AppBundle/Manager/LDraw/TypeManager.php
new file mode 100644
index 0000000..e86e18f
--- /dev/null
+++ b/src/AppBundle/Manager/LDraw/TypeManager.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace AppBundle\Manager\LDraw;
+
+use AppBundle\Entity\LDraw\Type;
+use AppBundle\Manager\BaseManager;
+use AppBundle\Repository\LDraw\TypeRepository;
+
+class TypeManager extends BaseManager
+{
+    /**
+     * TypeManager constructor.
+     *
+     * @param TypeRepository $typeRepository
+     */
+    public function __construct(TypeRepository $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    /**
+     * Create new Keyword entity with $name or retrieve one.
+     *
+     * @param $name
+     *
+     * @return Type
+     */
+    public function create($name)
+    {
+        if (($type = $this->repository->findByName($name)) == null) {
+            $type = new Type();
+            $type->setName($name);
+        }
+
+        return $type;
+    }
+}