Did you purchase Partmaster Level 2 or 3D Cam Level 2?
Partmaster Level 2 is 2 & 2.5D programiing. It can not do 3D work. You can save your Alibre files as a .DXF and import them that way.
If you have 3D CAM, you can import many files.
DXF, IGES, STEP, Rhino 3DM and a few others.
Dolphin is currently developing the new 3D CAD/CAM that will support pretty much all file types.
Has this been helpful? Let me know!