Tutorial how to add part to part in SW

Tutorial: How to add part to part
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Step 1:
go to insert>>part
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Step 2:
select the part that you want to add
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Step 3:
add mates like in assembly
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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.