1. Open a constituent record.
  2. From the Constituent menu, select Copy Preferred to Alternate. 
OR
  1. Open the address.
  2. Select Address from the Drop down menu.
  3. Select Copy Preferred to Alternate.
Note: Copying the preferred address to an alternate address ONLY creates a copy on the selected constituent record. If the preferred address is shared, the links will remain on the Preferred Address even if the preferred address is later changed. Changing an address to alternate address will not break the sharing.

To set a Business Rule that uses a default Address Type when copying Preferred to Alternate, see How to copy a preferred address to alternate and default the address type