Using Change Assistant to see multiple domains

How do you get Change Assistant to point to one hub and allow you to pick between multiple environments during apply change package?  We want to set it once and pick the region you want to apply package to, i.e for tax updates, we go from demo, to dev, to qual.

 I had one hub running against my dev environment and concatenated the dmo and dev environment and could pick between the two.  I was excited at first. However, if I concatenate the unixdrivestocrawl with 2 of my own environments, it only sees Peopletools as the product, and then one region, usually whatever the last region that is in the concatenation.