Need "Reset Button" in Google Sheets to revert drop down lists to one of the options ("None") instead of clearing cells completely [closed]

thanks for reading.

I am attempting to create a fee calculator for a small business which uses the INDIRECT and SUM functions along with drop down lists to find the total fees if a family enrolls in several different class levels with different prices, uses coupons, etc, the values of which are pulled using INDIRECT from another hidden sheet. The SUM function only shows reference errors if I leave the drop down lists blank, so I have to assign the value of $0.00 to the word "None" and make that the default option in the drop down lists.

So, instead of a Reset Button script that completely clears the drop down lists, I need a Reset Button script that reverts all the drop down lists to the "None" option. Is this possible?