L&L 15 - How to Sum a column

Hi All

I am fairly new to this List and Label software so please bare with me! My work use it currently for quotes to clients, the owner wanted the quotes to be split into columns so that labour costs are shown in one side and Materials shown in a second column. I have managed to do this yesterday, but he requires a total at the bottom for both columns. I cannt figure out how to do this! I literally started using the software yesterday (as i actually work in accounts, so have never used list and label)

We have list and label 15, i can only find info on List and label 18 on how to do this…

If anyone can help it would be much appreciated!