You will need to use at least two input channels, for instance ST1 Left Right and ST2 Left mono for the click, assuming the tracks are in stereo. The channel with with the track music will be brought up in the main mix and on monitor mixes for the needed IEM’s.
The channel with the click will only be brought up on the needed monitor mix sends and
on the main L R mix layer the fader is turned down. To be safe you may want to un assign
the click channel from the main mix.
The monitor sends should be all set to PRE FADE.