Relationship Between Forms and Subforms for Reports

Relationship Between Forms and Subforms for Reports

I am trying to generate a report that simply shows me the sum quantity products sold.

Form Name: Order:
- Name
- Address
      Subfom Name: Products:
            - Product
            - Quantity

How do I generate a pivot chart report that gets the data from the subform?
When I try to generate a report from the Order Data, I do not get the fields of the subform, and vica-versa.

How do I run a report of this data with relationship?

It seems the subform model is very broken because the relationship is inherently not there.