1. Open the original Recurring Gift record
  2. On the Gift tab, change the Status/date field from Active to one of the following options: Held, Terminated, or Completed. 
  3. Save and Close the gift.

This will prevent the prompt "This constituent has at least one outstanding recurring gift. Would you like to apply this gift to a recurring gift?" from appearing when adding new gifts for the constituent. 

If EFT module is present, the gift will no longer be automatically brought into batches using the Automatically Generate Transactions or Payments option.