I've read this post three times, but I can't get into my head what you are looking for... thick, I guess.
Parent parts show up as On Work Order and go straight from there into stock. They don't go into WIP, so that is not what you are talking about.
Parts that are issued to a WO go into WIP, but you said that you don't want the components on the WO, just the parts. Hmm.
You are not looking for a list of all Work Orders completed for a certain date... Nor WOs created on a certain date...
I thought I knew a lot about reports, but I can't grasp this one