So unless you already have more than 3 TV's installed you are going to have to:
1. Install the 4X4 multi-sat switch (this will bring all 4 lines from your (2)82LNB and (2)91LNB into one powered unit that can now be split into 4 different feeds)
Will look something like this :
2. Run another line from the multi-switch to the 9245 system so you have two coming into your receiver. You could keep it with one line coming in but then you wouldn't be able to do things like: Record one show while watching another, or, record two shows while watching a PVRd one, or, PIP.
Because you are already have HD you won't have to touch the dish at all, you will just have to swap out the switches you have now for that 4X4 multi-sat switch and run one cable.
How many TV's and REC's(which models?) do you have set-up in your house right now? I could use paint and draw up a cheezy diagram if you would like.