round robin generator

I am looking for help with generating a unique round robin format. I have 2 pools of 6 teams each who will all play each other. In addition, I want the #1, #2 and #3 team from pool A to play the #4, #5 and #6 team from pool B and the #1, #2 and #3 team from pool B to play the #4, #5 and #6 team from pool A.

The tournament will play over 3 days and can use 6 time slots and 4 courts.

Can any of you smart people help me makes something like that. Thanks.