When it comes to making revisions in Excel, there are a few things you need to keep in mind. First and foremost, you need to make sure that you have a backup of your workbook before making any changes. This way, if something goes wrong, you can always revert back to the original version. Secondly, when making revisions, it's important to only make changes to one sheet at a time. This will help prevent any accidental changes from being made to other sheets in the workbook. Finally, when saving your revised workbook, be sure to save it as a new file so as not to overwrite the original.
Now that we've gone over the basics, let's take a look at how to actually make revisions in Excel. The first thing you'll need to do is open up the workbook that you want to make changes to. Once it's open, go ahead and make whatever changes you want on the first sheet. Once you're done with those changes, save the sheet by clicking the 'Save' button on the toolbar or by pressing 'Ctrl+S' on your keyboard. Now move on to the next sheet and repeat the process until all of the sheets in the workbook have been revised.
Once all of the sheets have been revised, it's time to save the workbook as a new file. To do this, click 'File > Save As' on the toolbar or press 'Ctrl+Shift+S' on your keyboard. In the 'Save As' dialog box that appears, select a location for the new file and give it a name. Be sure to select 'Excel Workbook (*.xlsx)' from the 'Save as type:' drop-down menu before clicking 'Save'. And that's it! You've now successfully made revisions to an Excel workbook without overwriting the original.