You can merge a customer with a customer and a vendor with a vendor. The process to merge either customers or vendors are the same.
Note: Customers/Vendors that contain the same currency and same GST treatment can only be merged. Transactions associated with the customer/vendor, once merged, will be listed under the master customer/vendor’s transactions.
To merge two customers/vendors:
If you would like to merge more than two customers/vendors:
The master customer/vendor will retain all the transactions of the merged customers/vendors and the merged customers/vendors will be marked as inactive. You can mark the customers/vendors active again but this will not transfer the transactions back to the merged customer/vendor.
Insight: You cannot merge a customer to a vendor. But in case, a person is both a customer and a vendor, you can link them.
Books
Online accounting software
for small businesses.