Solidworks 2019

First time trying to use Tab and Slot feature (honestly didn't know it was there - and thinking I might want to forget it is). Might have a couple questions in this one post.

Working in an assembly and trying to add tabs and slots in sheet metal components as I bring them together in an assembly. Everything looks perfectly fine in the model as I am doing this...however, when I switch over to individual parts to make adjustments or create the drawings for these parts, my tabs aren't there or the slots aren't there.

1) In an assembly state, do I need to make the tabs/slots independent of the model? No, this isn't a right-click option, so I am assuming there would be some other name or step to relate if required

2) How do I make these features stay after creating them?.

3) I have multiples of the same part that needs to be inserted in to the model. When I create the tab and slot for the first piece, the tabs are automatically created for the remaining inserted pieces...how do I create the slots for these pieces?