I need to fix a boo-boo.  It's something I remember doing, but not HOW...  I have an assembly of parts, then at the level of assembly, I put in some machined fratures.  What I SHOULD have done is make the assembly, save it (let's call it a weldment... see the booboo?), THEN insert that assembly into a new assembly (call it the machined weldment, for example...) and do the machined features.  When I use the feature to make the subassembly, some of my machined features dissappear from the next assembly.  I'm not very hopeful, but is there a way to save this?  If not, frankly I haven't done very much to the "weldment that never was...", so it won't take TOO long to redo.  Thanx.