In EPG select Multi EPG, then select "provider order"
If you put VM first followed by Sky you will get a list of groups, sports, kids, movies etc all running off the cable tuner, followed by the same list of groups further down
running off the sat tuner.
It's handy for recording, if you record on cable it's easy to find the sat channels and vise versa to watch another channel.
Or if you want the sky groups first put that first in the providers order.