There is an alternate part number feature that allows you to keep several p/n's associated with the same product. When looking / entering a part on a work order, these alternate numbers will also find the part.

It would also be nice to be able to pull multiple items from inventory at the same time. Wipers for example, I stock them all and instead of choosing each size I could just click each then add them to the WO.

This is a superb idea, I have wished for this same functionality. It already exists for service packages. For inventory items this would really speed up adding similar items. Good request!

I would like the ability to duplicate any part, inventory or ordered.