To modify an existing custom field:
- In the Custom Fields section, double-click the Custom Field you want to edit.
- In the Edit Custom Field screen, update the field Label, Identifier, or Item(s) as appropriate.
- Select the item to keep and click Merge.
- The Merge Field Items screen will open.
- Select the item to remove.
- Click Merge. This will update all existing referrals to use the item label that was kept.