I'm using a group option frame with 6 option buttons to filter on a form. What I would like to do next is filter this data further with an unbound text box. Please help!

The ApplyFilter method of the DoCmd object will allow you to specify more that one criteria for the filter. The Help files will illustrate how to use this function. I would use in in the AfterUpdate of the Option group Frame and the Combo box. Be sure to trap for either field having a null or zero value.
Good Luck
Chris