Multiselection Criteria from Unbound subforms in a form

[zionman4]

I am trying to create a multiselection criteria form for users with no prior knowledge of Access.
In this form, they would select fields from different tables, one at a time. On one subform, I would like to display those available fields and on the other subform, the selected fields. I then would like to display the results in a query.
I'm not sure how to attach a sample to this post but I can email it to you.

Thanks!