Yes, you can definitely place a button that will reset all cells to zero. Here are the steps to do it:

1. First, you need to add the Developer tab to the ribbon if it's not already there. To do this, right-click on any tab on the ribbon and select "Customize the Ribbon". In the Excel Options dialog box, check the box next to "Developer" and click "OK".
2. Click on the Developer tab and select "Insert" from the Controls group.
3. Scroll down to the "Form Controls" section and select the "Button" control.
4. Click and drag to draw the button on your worksheet.
5. Right-click on the button and select "Assign Macro".
6. In the Assign Macro dialog box, click "New" to create a new macro.
7. In the Visual Basic Editor, enter the following code:
   
   
   Formula:

   Sub ResetCellsToZero()
    Range("A1:Z250").Value = 0
End Sub 

   Note: Change "A1:Z250" to the range of cells you want to reset to zero.
   
8. Click "Save" and close the Visual Basic Editor.
9. Back in the Assign Macro dialog box, select the macro you just created and click "OK".
10. Test the button by clicking on it. All the cells in the specified range should now be reset to zero.

That's it! You now have a button that will reset all cells to zero with just one click.