[tcmschlosser]

Thanks to all for useful advice.
I decided on using the Collections option.

Put all my current songs (in 3 albums Realbooks 1,2,3) into a collection called "Concert"
Then imported the Eb songs with tag Album Realbook 1 Eb
Finally made a new collection called Eb and put the newly loaded songs into that.
Works well.

The reason for having these different versions is that I'm actually doing it for a jazzer friend who plays both flute and Baritone Sax so needs them both.

In response to using two different instruments, I play Clarinet and Bass Clarinet have music for the same piece for both instruments. What I did was in the "custom" field, put what instrument the part was for. Example:

Title: America the Beautiful
Artist: Samuel A Ward
Album: Orchestra
Genre: Instrumental
Custom: 2nd Clarinet

Title: America the Beautiful
Artist: Samuel A Ward
Album: Orchestra
Genre: Instrumental
Custom: Bass Clarinet

Then when I pull up my Orchestra album, I have it where the it has the name of the piece, and on the same line it lists the custom section so I can immediately see which part I need to pull up or put in my set list. I found this to be REALLY easy!

Hope it is helpful.