Supplier Site Onboarding Process

We are using supplier onboarding process to register a new supplier on Oracle. (version EBS R12.2.7). For the very first time,  we send the OU Encrypted link to supplier, hence when supplier is registered , it  is registered along with supplier site for that operating unit.

Now for the same supplier , we need to onboard a new site with the same onboarding process,  as supplier sites are big enough and spread across multiple locations in a country. Can you please suggest how this can be achieved through on boarding process. Any inputs will be really helpful. Thanks in advance.