Each row is one item. Columns hold the description, the drawing sheet, the dimensions, the quantity and the unit of measure.
A concrete takeoff sheet might list each footing type with its length, width and depth. The sheet then totals cubic yards.
Keep one layout for every job. Record the drawing sheet for every row. Keep waste and extras on separate lines so the measured quantity stays visible.
A clean takeoff sheet lets someone else check your work. It also answers questions after award.