> Another solution is to use filters: (Options/Scan rules)
> 
> -www.geocities.com +www.geocities.com/alpha/* 
> +www.geocities.com/beta/* +www.geocities.com/charlie/*

Sorry, the correct one is:
-www.geocities.com/* +www.geocities.com/alpha/* 
+www.geocities.com/beta/* +www.geocities.com/charlie/*