Have a look here:
https://arubanetworking.hpe.com/techdocs/sdwan/docs/orch/orchestrator/server/cloud-portal/#secondary-accounts
If your orchestrator does not have this option then you will need to upgrade to a newer version.
Major pain is you need to move appliances and configuration over from one Orchestrator to the other and you can't have two active Orchestrators for one account. Minor pain is you can't assign licenses from account #1 to hardware belonging to account#2.