Hi,
The thing is you not supposed to import a structure from ASD Steel back into Revit. Asd Steel is there to create the final product.
The other way is to do the steel in asd save as block and import it into revit, but you dont do any steel work in revit. You can see the steel structure but wont be able to tag the members unless you use text. You can dimension it, but that is as far as it goes.