Is a 12 bar blues song that is 12 measures long starting in the key of A, changes to the key of B starting on measure 13 and repeating the chord progression, then C starting at measure 25, the D at measure 37 and finally E at 49 what you're trying to do? (see attached Chord Chart)
If so, BIAB can do this fast and easy. Let me know if I'm interpreting your task and I'll explain how to do it. No need to explain unless I'm guessing the correct task.

Charlie

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Chord Sheet Screen Shot.png (142.79 KB, 116 downloads)

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