You can easily migrate account data by following the steps below.
Please note that this action is irreversible.
Navigate to the Accounts page
Select the Account you want to keep
In the left-hand navigation, click History
Next click Merge Others
Search for the other account (victim) to merge into the current one (keeper)
Confirm to perform the merge
The victim account is now an empty account that is renamed and disabled (not deleted)
The set of data that is migrated:
All top-level account properties
Contacts
Tastings
Communications
Orders
Attachments
Notes
Allocations
Wine Interests
Additional Addresses
Keywords
Sales Rep Assignments
Note: The logic never overwrites a keeper property. It sets it if the property is blank.