Hi Rob, I think you'll need to do it custom since a lookup and a party list are different types, which will keep you from using the built in functionality. It would be straightforward to do in either form javascript or as a plugin, javascript would probably be the way to go. If you're on your entity and create a new Phone Call record, your custom entity will be set as the regarding object ID. You'd want to write javascript on load of the Phone Call form like: - If the form is a create form - and the regarding object is a {custom entity} - retrieve the related record and get the contact - set the contact as an activity party on the to field This should give you what you're looking for. If this was helpful I'd appreciate if you marked the answer appropriately. Thanks, Aiden
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