Tutorial how to add part to part in SW

Tutorial: How to add part to part
Step 1:
go to insert>>part
Step 2:
select the part that you want to add
Step 3:
add mates like in assembly
Step 4:
The added part features will add end of the feature tree.
I think this function would be usefull for you. you can try to save assembly as part. but to do this sometimes convert bodies to surface as I see.