How to delete the old customer to sync the customer list with SAP

Hi,

We have some old customers (Organizations) configured in our solution manger system who are no more supported by us but still show up as sold-to-party in our system. How should I delete those customers with their users?

Also when we logon to SAP market place to report an incident for our customer, we see the list of our VAR supported customer which need to be sync with our solution manger, I see some old customers whom we are not supported, what is the procedure to delete them from there?

Thanks,

Charly