A What-If Data Table calculates a formula repeatedly while substituting different inputs. Your model stays in its original cells. The table holds trial inputs and the resulting outputs, so you can compare choices without repeatedly editing the model.
For a column of trial inputs, put a link to the output above and one column to the right. Select the complete rectangle and choose Data > What-If Analysis > Data Table. Enter the model's assumption in Column input cell. For inputs across a row, use Row input cell instead.
A two-variable table puts one output formula in its upper-left corner, one input list across the top, and the other down the left. Match each input cell to the direction of its trial list. A blank input is a value too, so inspect the entire grid.