Feature request : do permutation only on one subdomain

[Serizao]

Hello,

nice tool and thks for that :)
I would like to know if is possible to add permutation only on subdomain besause i use this tool in my workflow but the scope is wildcard on subdomain (exemple : *.xxx.yyy.com) . When i use this tool to genrate some permutation it generate all permutation on main domain (*.yyy.com) even if all subdomain i provide to it (exemple : eee.xxx.yyy.com or fff.xxx.yyy.com) concerne only one subdomain.