Constituent record requests allow you to add constituents after the request is submitted.
You cannot add new constituents to event or group requests if they are not part of the selected Research List. You can, however, add back deleted constituents. For example, if when creating your request you delete two group members and later decide you want to add one or both back to your request, you can do so with the Add prospects to request option. Or, if additional constituents have been recently added to the Research List, these may also be added to the request with Add prospects to request.