To transfer a membership and all related history from one constituent to another,
  1. Go to the constituent's record
  2. Select the Memberships tab
  3. Click Other tasks and select Transfer membership.
  4. The Transfer membership screen appears. In the New primary member field, click the magnifying glass to search for and select the constituent who receives the transfer of membership.
  5. Edit the expiration date if need be
  6. Click Save
If you instead need to combine two memberships for one patron, please refer here.