Bubble Charts - Assigning Multiple Values the Same Color Bubble

[cognos_guru]

Hello,

I am trying to put together a bubble chart that will assign multiple values within a group the same color.  I have three parent groups - all with many child bubbles. 

Using the conditional palette, I can only get one of the three parent groups defined to receive one color.  Ideally, I'd like to apply two conditions and put the third group in the "leftover" color.

Any ideas?