Change 'Add New' action to a populated enum list

[JBGreenpaths]

Hello,

I have a form that populates a field (account) based on the page the action was on  (account details page). This also sorts a contact table to populate the contacts associated with that store. This all works great, however the 'add new' button on the list (in the instance where a contact doesn't already exist or there's a need to add an additional contact, opens a form without the store populated. I believe it's a system generated add new but I can't figure out where to customize that. My thinking is that if I do a lookup by userID for the last row on the previous form, it will populate the necessary store but I can't figure out where to do that.