Hi Adam,

Yes, you can definitely use a check box to lock and unlock cells in Excel. Here's how you can do it:

1. First, insert a check box from the Developer tab. If you don't see the Developer tab, you can enable it by going to File Options Customize Ribbon and checking the box next to Developer.
2. Once you have inserted the check box, right-click on it and select Format Control.
3. In the Format Control dialog box, go to the Control tab and select the cell link option. This will link the check box to a cell on your worksheet.
4. Choose a cell to link the check box to. This cell will contain the value TRUE or FALSE depending on whether the check box is checked or unchecked.
5. Now, you can create a macro that will lock and unlock cells based on the value of the linked cell. Here's an example macro:
   
   
   Formula:

   Sub LockUnlockCells()
    If Range("A1").Value = True Then
        Range("B1:B10").Locked = False
    Else
        Range("B1:B10").Locked = True
    End If
End Sub 

   In this example, the check box is linked to cell A1, and cells B1:B10 are the cells that will be locked and unlocked. When the check box is checked, the macro will unlock the cells, and when it is unchecked, the macro will lock the cells.
   
6. Finally, protect your worksheet by going to the Review tab and clicking on Protect Sheet. Make sure to check the box next to "Select unlocked cells" so that users can still select the unlocked cells.

That's it! Now, when you check or uncheck the check box, the specified cells will be locked or unlocked accordingly. Let me know if you have any questions or need further assistance.

Best regards,
[Your Name]