Hi Ryan,
Thank you for using Syncfusion products.
Currently, we don’t have support for “Add New Row functionality in GridData control when mapped to complex properties”.
However, we do not provide confidential information and patches in the general forum.
You can also create an incident in our Direct trac account with the below link.
https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents
That would be helpful for us to fix the issues and provide the patch through incident.
Please let us know if you need any further assistance.
Regards,
Ravi Shankar B.