Mike,
if I remember since 9.1 ... or may be M060, there's no need anymore to have modifiy permission on CADDocuments to associate them to WTparts. Links are owned by WTparts.
Shaun
There's Out of the box loader tool that permit to load in WTpart and BOM links ... quite easy to build csv files if you have a correc Partt information in another tool like excel or ERP database...
regards