I hope I'm understanding. It's even easier in the Data Environment. Just create the second relationship from parent table to child table 2 in the same way as you created the first relationship from parent table to child table 1. You don't have to do any coding at all. To verify that you have things set up correctly open the data session window.
Did this help?

>I am doing this through the Data Environment in the Form Design. I am not sure where you add the Additive portion in the Data Environment Properties.
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>Thanks
>Greg