My company is looking at the pros and cons of including a revision column to assembly drawings to reflect the subcomponent revision. On typical projects we have 4-5 levels in our top-level assembly. We are starting to get into using more components on multiple projects. Top-level system revisions aren't a concern to them nor is revising every assembly drawing between subcomponent to top-level drawings.

I'm looking for input as to the pro's and con's of such a system. What type of impact, other than time (because time isn't important o.O), could this type of change make? By what other means could revision information be transfered to vendors (that make assemblies) to show them exactly what has changed?

Thanks