copy upfront builder theme

Hello, is it possible to rename a theme built with upfront builder, so it becomes another theme to be used in the same multisite? The main reason is to activate it on a subsite with additional features. It prevends me from creating the same theme again from scratch and it would allow me to build more layouts, without them being saved in the original theme. An exact copy actually, so I can add other elements and layouts,
Thanks,
Frenk