How do I wire my 4066N analogue switch
Each of the nY and nZ connections are connected internally, with the nE pin controlling them. So, connect both wires of circuit 1 to nY and nZ pins with the same value for n, do the same for both wires of circuit 2, connect the control output to the corresponding nE pins, and tie the other two enables high or low.

And of course make sure that the circuits do not violate the absolute maximums given in the datasheet.