I have created a table that has numeric fields in them. I am trying to calculate from two fields and generate result in to one cell. for example, first column cell starts with beginning quantity, second column cell is to type number of quantity to remove from the beginning cell and third column to add to the beginning cell. the calculation should be populated in the fourth column cell. I am able to create add calculation script to fourth cell by just adding — Sum(begin1+add1) — but can’t figure out subtract to the same field.