[RVDowning]

As Charlie says, Setlists are probably the way to go; at least until you get more familiar with the app.
Setlists also allow you to order the pieces and/or include one more than once.

Another alternative is that you add a piece to more than one collection - probably not as versatile as Setlists as sorting is not so easy.

Geoff

Actually, that is what I have been doing, namely adding a piece to more than one collection.  I am only a low/mid level intermediate player, so I'm not talking about much of a repertoire here.