I have a form Application with a subform Tools.  Tools is a form in its own right, and I have a view of All Tools.  However, I can't find a way to show in All Tools which Application each tools record is associated with (unless I add a lookup field for the parent id, which feels unnecessary). 

In Application, I can refer to "input" or "row".  In Tools, I would love to be able to refer to "input" or "parent".  Is there a way around using a lookup field, given that the relationship is stored internally by Zoho.  Does anyone know a better way to reference a parent record please?