Pro tip: save a bare-bones copy
If you’ve created a workbook that you think you’ll use again, you can save yourself some time. Save a new copy of that workbook, then delete the data that you won’t reuse.
Keep column headers, formulas, and anything else that will be the same in each iteration. Just get rid of the stuff you won’t need next time.
Now, when you open a copy of that spreadsheet, it’ll be like opening a template.