I rendered a new model of all sheetmetal parts, as individual parts in an assembly doing top down.   Now needing to combine some of the parts into formed parts, I have been told I should have made the part a new to me "multi-body sheetmetal part".   Ok so now going back and recreating the rendoring into to a multi-body part.   I am copying and pasting each sketch of the seperat parts from the original drawing and pasting them into the multi body part.   Then using the sheet metal flang tab, turning them into the part.   I need to position them to eachother like an asselbly.    I cant find mates, so does this mean I can not position them using the mates comands avalible in an Assembly?

Thank you,

Mark