I made a column for just showing the labor, by making a forumla for it, such as cost - material cost columns (i am entering the values to material column.)

The costs in the labor column, is not adding up to summary tasks. The costs at summary tasks are 0 (zero), although the tasks under it are greater than zero.

See my reply to your other post. You need to ensure the option "Calculation for group or summary rows" is set to sum.

Julie