You cannot do that through TurboTax or even by yourself through the IRS. You need legal advice and help from whatever agency administers spousal/child support orders in your county or state. They have to put in a order to seize his tax refund and eventually turn it over to you.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**