Move top level genre to existing top level genre

Everything working fine after 2 months. When I initially set up genres, I set as top level genres Jazz Vocals, and Cool/West Coast Jazz. After using Roon I realize that they would be better as sub genres of the top level genre Jazz. how do I make this move? There are thousands of tracks in each of these genres, so doing it at the artist or album level would take more time than I would like. Thanks for suggestions!

If you’ve used genres extracted from file tags, then you can use genre mapping to adjust your genre hierarchy. See the section on Genre Mapping here.

Thanks. Got it done the way I wanted.