You mean you have 15 V-Scanners? If that's so, you can only scan one at a time. WITHIN each V-scanner you have 200 possible scanlists that you can enable/disable from the scan simply by pressing in the scanlist number from the keypad. Make sure you understand the hierarchy. Here it is from smallest to largest:
Object - individual frequency or talkgroup. Must be included in a scanlist in order to hear. Can be included in more than one scanlist.
ScanList - A group of objects that you scan together. There are 200 of these per V-Scanner and you can scan as many or as few as you want at any given time. Toggle them in and out of the scan be punching in their scanlist number on the keypad.
Scan Set - A group of Scan Lists that you have chosen to put together. Any Scan Set can have as many or as few of the 200 scan lists that you want. There are 20 Scan Sets per V-Scanner and you can scan as many or as few as you want at the same time. Unlike Scan Lists, Scan Sets have to be selected in the menu. (5th item on Main Menu, I think)
V-Scanner - The total programming of your radio at any one time, with 200 Scanlists (plus Skywarn) groupable in 20 Scan Sets. You can't access more than one V-scanner at a time.
Think of V-Scanner as a document you call up, and can manipulate the words, sentences and paragraphs while it's there. Your other V-scanners are other documents with different words, sentences & paragraphs. It's like the days before Windows--you have to close one document (V-scanner) in order to open another.
73/Allen (N4JRI)