How to set var to select column name?

[Andrew_lu1933]

in power query, if I want to operate one column, we will  use _[columnName].

but if I want operate many column, I want use List.Transform({columnName1, columaname2},(t)=> operate(Table, [t]).

how to pass columnName var to operator this column?

[wdx223_Daniel]

List.Transform({Column1,Column2},each List.Sum(Table.Column(tbl,_)))

[watkinnc]

You can try

each (row)=> List.Tranform({row[Column1], row[Column2]}=> operate(Table, [t]))

--Nate

[Andrew_lu1933]

[t]  , the t is only as a str, not as a var.

[Vijay_A_Verma]

If you can explain what exactly you are trying to do, then experts here can suggest the right solution. 

When you are doing List.Transform({columnName1, columaname2},(t)=>, it is t which contains columnName1 & 2 one by one and whatever you are operating on t will be applicable on columnName1 & 2.