Sum all Columns that contain a string in the column name
I'm trying to take a data table and add a column with a formula that sums all columns that contain the string "ToAdd" in the column name. I'm trying to script this because the columns that will have "ToAdd" somewhere in the name will change.So far, I have the script that can collect all the column names into a list, but I'm not sure how to then use that list to generate a new column with a formula...