bom & balloon sequence

Hello;

     This is probably pretty simple but i'm not finding it. I have 4 bom items & 4 balloon items. The order of the sequence is off. If i make the balloons 1,2,3,4, then the boms are out of order. If i put the boms in order, then the balloons are out of order. How do u synchronize both together?

     Thks in advance for any help;

             rob_d (2009 stimulus)

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