There are no "banks" in the PSR-500. A scannable object (e.g. conventional channel, talkgroup) can belong to one or more "scan lists".
If you want change the scan list assignments for those objects, you'll need to do it in the "CONV" and "TSYS" tabs. Select the objects you want to move, then check/clear the boxes to the right under "Scan Lists".
Alternatively, you can use the "All Objects" tab and copy/paste one scan list at a time into a second P500 file, changing the scan list assignments as you go.