Hello kele,
For your kind information, a purchase code/license is for only using one active domain/sub-domain/directory/sub-directory. To activate the theme on a new domain/sub-domain/directory/sub-directory, you need to deactivate the purchase code/license from the existing domain/sub-domain/directory/sub-directory where it installed now or you could buy another license to use the theme separately in a separate domain/sub-domain/directory/sub-directory.
There is an option to activate the plugin on a new domain/sub-domain/directory/sub-directory, you need to deactivate the purchase code/license from the existing domain/sub-domain/directory/sub-directory where it is installed now.
Moreover, activate the multibranch addon license to get the multibranch option.
Also, check out this https://themelooks.net/documentation/plugin/foodbook/how-to-work-multi-branch-system/
If you need more assistance then please create your own topic instead of posting a reply to someone else created posts. Because the post creator can feel bothered by getting unexpected notifications of every reply of his/her created post.
Best Regards,
ThemeLooks Support Team