is it possible to add a 5th and 6th dish to my cw600s premium:)
or even better can i add more i allredy have 4:)

It depends on what dishes/LNBs/switches you are currently using. We can only speculate on what you want.

For six SATs I use two diseqc switches and one SW21 switch for each receiver. Three circular SATs go into one diseqc and three linear SATs go into another. Then both diseqc switches go into one SW21 switch.