>>>Do you mean selecting Position Content instead of Flow Content?
I think I had an example that I posted in the past that has similar subform setup. Click
here to see the example.
>>>>I often find after I create a subform its properties are 'grayed out'......
This is because the parent subform is a "position content" subform.
When you have a subform that is a child subform of a "postion content", the properties that you mentioned above are not relevant to that child subform.