Exactly correct. Having a one to one relationship between drawings and parts / assemblies makes things much easier, also make sure that the part name and the drawing name match each other.
Older Engineers at our place used a 'project' paradigm for tooling and fixtures that were used together such as XXX.ASM, XXX-1.PRT, XXX-2.PRT, XXX-3.PRT, etc...all one several sheets of one drawing XXX.DRW
The reasons were twofold, one we did not have any PDM to help find associated parts, and two PTC used to charge extra for Pro/Report on drawings so BOM's were not associative so we did not have this option.
Given the option, I would NEVER suggest having a one-many relationship between parts/assemblies and drawings.
Christopher F. Gosnell
FPD Company
124 Hidden Valley Road
McMurray, PA 15317