I am new to LBP and am still evaluating the product. I have tried searching the forums and documentation, and can only find a few posts from more than a decade ago mentioning looking into this possible feature. I keep track of cross country time by distance i.e. greater than 50nm and less than 50nm. So I have set up two custom time columns XC>50NM and XC<50nm. Is there a way to have a third column called All XC automatically filled in by the sum of XC>50nm and XC<50NM for each flight entery?