The Other Column (as well as the Database Field Columns) are displayed on the Edit Valid Entries screen by pressing the Other Fields Button. Click the checkbox in the Other Column to enable values to be entered in the Database Field Columns. When a Valid Entry with the Other Column enabled and with values entered in Database Field Columns is selected for entry on a Database record, both the Valid Entry value and the values for the Database Fields are automatically entered on the database record. Database record fields for which Database Field Columns contain no values are not updated.
See:
Database Field Columns
Database List Editor Contents