If you need to copy a formula but NOT have any changes to it (meaning it won't work until repaired in the new sheet), you can put a single quote at the very beginning of the formula which will turn it into a text object. This can be copied like any text object wherever desired. Then once the formula is at its destination, you can edit it to repair the references. This seems like a lot of work, but it is a useful process. You can even keep copies of complicated formulas on a "documentation" sheet as part of the workbook. Makes it easy to fix things when some other user tries something clever and breaks things.