The Support Desk has found another answer to your post.

You have to use copy geometry from other model, using this command you can copy any feature from other parts, in your case for example you have a housing and you want to use the inner surface for cutting to your new part just use the command, proe will as you for a reference part then open the housing and select the inner surface/s and use the surface to cut your new part, whatever change you make from your housing your new part will automatically update. Hope it helps

jayuy
MCADCentral.com