Update ManagingAssets.md

Author: Roberto De Ioris

docs/ManagingAssets.md

@@ -127,6 +127,16 @@ from unreal_engine.classes import PyFbxFactory
 asset002 = ue.import_asset('/Users/FooBar/Desktop/warrior001.fbx', '/Game/Meshes', PyFbxFactory)
 ```
 
+or
+
+```python
+from unreal_engine.classes import PyFbxFactory
+
+factory = PyFbxFactory()
+
+asset002 = factory.factory_import_object('/Users/FooBar/Desktop/warrior001.fbx', '/Game/Meshes')
+```
+
 If the factory supports options, you can instantiate a factory before use:
 
 ```python