Name={$2}

[Abhi999]

If($(Num(Count({<$($1),[%ID_Cycle_Plan]={*},Channel_Code={$2},Cycle={1}>} DISTINCT %ID),
vMaskInteger)($1,$2))

in above expression just want to know Channel code ={$2} what it perform. I f anyone have any idea on this please help me.

[tresB]

This looks to be a variable definition with parameters. $2 is the second parameter. When you call the variable, you are expected to pass two arguments to it. The second argument is supposed to be a value to channel code.