If you do want to switch at some point, you can copy the campaign, leave you original untouched and change the sheet in the copy. Then open another browser (this makes things a lot easier*). Then open the original campaign in that browser, your original campaign in your usual browser, and compare the 2 campaigns and see how much you need to fix in the new one. If it looks like too much, you can just abandon it with no damage done to your original. * Note: having different campaigns open in the same browser is risky - if either of them refresh, it might reload the wrong campaign, and its easy to get confused about which one you are working with. Having them in separate browsers is completely safe and much easier to work with.