cascading combobox help

[twychopen22]

I have cascading combobox that fills in 7 txt boxes. I have a query that does that. I have two calendars and I want to have the selected dates be 2 fields on that same query that way I can use that query again to show a report based on the combobox selection and the 2 dates. (the records on and inbetween the 2 dates will be shown) I need to have 2 more date fields but don't know what to put (kinda like a parameter) but I don't know what to put in.