I name mine with a numeral in front of each with 1 for Jazz, 2 for Classical, etc., and sort alphabetically. This worked great until Roon created the new live music library. Now, if I enter a station manually in my library, and it exists in Roons library, it takes on the entries from Roon and I can’t edit those any longer .
Sub pages is a good idea. Or ability to assign channels to categories that would be sections on the page.