Rich, on the topic of welded assemblies, the best way to
model that, or for that matter, anything, is to model it
as you would build it. Clearly a welded assembly is an
ASSEMBLY and not a single part, and thus should be
treated as such. Bills of materials and cut lists are
very easy to create in Pro/E from the assembly.
Rule of thumb for pro/e is to do things as closely as
possible to the real world as possible. The software
likes that approach best, and that makes it easiest to
change things down the road. I have worked on both
software packages, and although SW might seem faster at
the start, you almost always end up spending way more
time trying to modify things later. Hence Bart's comment
about being paid by the hour. Hands down, Pro/e is a
much more robust package, and if used correctly will save
you lots of time and work over the life of a project.