Hello, DOPE400!
Sorry, I am finding your question a little bit confusing, however, I'll try answer as best as I can.
If you mean selling a set, yes you can do that, and it will transfer the items that are inside that set too, and yes they will be able to activate the items.
If you mean not selling a set, but a specific item from the set, you can remove the item from the set and transfer it that way.
I hope this helps.