When you merge a non-member record with another record, the system will convert transactions, payments, event registrations, donations and notes. Use this option to remove duplicate entries.
In the People Manager, search for the non-member.
In the Maintain Column, select More Options > Merge.
Select Member or Non-Member then click the link to select the destination name into which this non-member record will be merged. Click Save to complete the merge or Cancel to close the dialog without merging.