Let me show you how to manage your customers in QuickBooks Online (QBO).
We can make a customer inactive to remove them from lists and menus. All transactions linked with that customer remain on reports even if they are inactive.
I'm still using QB Desktop Pro 2017 and I need a Desktop solution to delete customers.
Renaming and merging unwanted Jobs and Customers is an interesting suggestion,
Merging Customers didn't work.
If 2 Customers have Jobs, when I rename the 2nd Customer to the first one's name, I get "This name already in use and cannot be merged. Names with subnames cannot be merged."
Back to Manually Deleting Deposits, then Payments, then Invoices, then Jobs, then finally Customers.