Dears, I want to categorise themes so that when a subsite

Dears, I want to categorise themes so that when a subsite user go to appearance->themes/ he get theme list table in two or three categories. I know pro site is solution but I do not want to install it as I use whmcs proviosioning and get order from different site and use domain mapping. I want to categorise themes so that clients see best themes in different category and common themes in different category. Is it possible to display best themes above than geneal themes. Any solution Please.