Sometimes you need to manage a large worksheet by hiding data - use the Outlining / Group options to add show/hide buttons to collapse your data when not in use.

Using Tab and Shift and Tab you can quickly change levels for your outline numbering. Tab moves forward and Shift and Tab moves you back a level.

If you get errors in your results in Excel, edit your formula so it starts with the 'IfError' formula. You can 'nest' an If Error formula and another formula to remove the error messages and it will look so much better