Welcome to the Community, 1accounts-arnhem!
You'll have to remove the sub-customers linked to each parent customer before merging them in QuickBooks Online. Here's how to remove sub-customer from the list:
- Click on the Sales tab.
- Choose Customers.
- Locate the sub-customer name.
- Click on Edit.
- Untick box for Is a sub-customer.
- Click on Save.
- Repeat the same process for other sub-customers.
Once done, you can merge the two parent customer after.
Furthermore, here's how you can export the customers via excel in QBO.
- Click on the Sales tab.
- Select Customers.
- Click on the Export Icon just right above ACTION column.
- The file will be saved under your Downloads folder and ready for use or editing.
For reference you can check this link to learn more about: Merge duplicate accounts, customers, and suppliers in QuickBooks Online.
Post again in the Community if you have other QuickBooks concerns.
