Anyone here familiar enough with spreadsheets to help me out? I'm using LibreOffice, on Linux [obviously!], and although I have decades of experience doing database programming, I know virtually nothing about spreadsheets. I have what I think is a simple requirement, but since I have no idea how to do it...it's not so simple. Assume there's a spreadsheet with six fields (columns). Let's say columns 3 and 4 are the columns of interest; 3 will have whole numbers entered into it; 4 should automatically keep a running subtotal. In other words: Code (Text): Column 3 Column 4 100 100 25 125 250 375 100 475 My brain isn't up to figuring this out myself right now, so any help--as in spelling out how to do this--will be greatly appreciated.