Vacation Home Channels vs Home Channels

I'm sure there is a way to do this - but a search yielded different solutions.

We have a few DTV Stream boxes at our home in Los Angeles and of course these stream boxes get the LA channel line up.

We also have a vacation home in Palm Springs and one of the three stream boxes is getting the LA channel line up and the other two boxes are getting the Palm Springs channel line up.

Since we like both the LA channel line up and the Palm Springs line up, I can't figure out how to set each box to a particular channel line up. In other words, at the vacation home we'd like the LA channel line up on one particular box and the Palm Springs line up on the other two boxes.

Thanks for any help!