The following example shows users of CATIA V5 how to quickly convert CATIA V4 model files into CATIA V5 part files without using any migration tools.
1) Open the CATIA V4 model file in CATIA V5. Right click on the MASTER node and select Copy:
2) Create a Blank new part:
3) Right click on the Part Instance Node in the graph and select Paste Special.
4) In the Paste Special Dialogue box select CATIA_SPEC
5) The part is now migrated to a CATIA V5 part file