I need to change some 50 to 60 top-level parts (part means part or assembly in this case) which in reality means I probably have 150 individual part and assembly files. Then I have all the associated drawing files. All I need to do is change the filename for them which needs to match the part number. There are no actual changes. What solution would let me do this the fastest? Right now I'm doing it one by one. We have no PDM.