Recently many users asked me whether their work with CPT 3.x will be lost once CPT 4 is released. Don't worry. Of course you can import old repertoires! It's an easy task actually:
After you select and load your old repertoire all sub-repertoires will be shown:
Select all sub-repertoires you want to import and then decide into which repertoire / folder you want to import the selected sub-repertoires:
There you are!
It's as simple as 1-2-3.
Regards,
Stefan