Forms :: Selecting A Table To Be Populated Using Cascading Combo Box

I am trying to use a combo box to control which table a data entry form will write data to. I want to create a form that has a combo box to select from a top level table that I will call "Stores". Once a "Store" is selected from the drop down, the next field on the form will be a data entry field. The data entered in that field will be written to the table selected by the preceding combo box.

So, basically I would have say Wal-Mart, Macy's, Sears, K-Mart and etc, listed in my "Stores" table. Once I select one of the stores from the drop down, I would then enter a "department" name in the data entry field and based on which store I selected from the previous combo box, the data would be written to that stores department table (which each store will have its own department table), e.g., WalMartDepts, MacyDepts, SearsDepts, etc...