For more details see the Merge and Disable Customers extension page.
Combine multiple client accounts together to keep all info about one customer in one place. Automatically transfer customer and order related data to the main account and disable unnecessary ones.
Step 1. Select necessary accounts.
Step 2. In the Actions tab choose the 'Merge accounts' action.
Step 3. Once the action is selected you'll see a dropdown with the accounts. Choose the main account to which all selected accounts should be merged.
Step 4. Click the Submit button.
Is active - With this option, you can manually activate/deactivate any account.