Anytime, if you wish to move your license to another domain or subdomain, you can simply add your new domain/subdomain at and activate that domain/subdomain to get the access code. If you have regular license, all your other access code will get deactivated as regular license can have one installation active at a time. If you have extended license, you can have multiple access code for different domain. 

Once you generate access code, you can then install it on your new domain/subdomain & your previous installation will automatically deactivated. You are also advised to remove your previous installation to avoid any license misuse notice.