I have a weldment that consists of a rectangular tube with sheet metal plates for caps on each open end, and I would like to add a rivet nut to this weldment cut-list. Can this be done? If not, then I would probably need to insert the weldment into an assembly and then add the rivet nut. However, all the items need to appear in one table if possible (combining the assembly BOM & weldment table). How have others done this in the past?

As a side note, where are the rivet nuts stored? Are they in Toolbox? I am using SolidWorks Premium 2012.