Pointing a drawing ref'ing a part to ref an assy?

I have a part file 41008235 that has become an assy to show the raw part number 41008205 and the paint number 41000095 together to make the part number 41008235 (which is an assy). I already have the drawing done as it is pointed to the part file. I want to redirect it to the assy file and hopefully it won't blow up to bad (I have 12 different instances to do this to). Normally, I save as copy the drawing and part as new numbers, close, in win exp. I change the orig file name with an !, open up the new drawing number and point it to the new part number, take off the ! and I'm done. For some reason, I have followed my normal flow, but when I open up the new drawing I get boxes instead of the old "cannot find wanna find it yo self". Is it because of going from a part to an assy? I am "form new sub here" in the higher sub assy before i do all the drawing and part save offs. Is tha killing the part drawing link? TIA