Currently I think the filter only does ORing of multiple genres. So you can't do what you want only using the filter (maybe something for a future enhancement to add ANDing).
What you can do if there are only two genres involved is switch to the Genre tab and select, say, "Upbeat". This will list all the songs in the Upbeat genre. Then add a genre filter for "Motown". Now you will get only the songs in the Upbeat genre that have the Motown genre too.
HTH
Andy
What you can do if there are only two genres involved is switch to the Genre tab and select, say, "Upbeat". This will list all the songs in the Upbeat genre. Then add a genre filter for "Motown". Now you will get only the songs in the Upbeat genre that have the Motown genre too.
HTH
Andy