You must add your servers to WHMCS and assign server modules to them. WHMCS supports server modules for many popular control panels.
Sync Accounts matches your records in WHMCS to your server's accounts and can help you resolve many account- or service-related issues.
You can use automated options like Sync Accounts or Importassist to migrate your data, or you can add data using manual entry.
Migrate hosting account services from an old cPanel & WHM server to a new one. You can choose from several methods for migrating accounts.