Automatically Clearing The YesNo Boxes

Hi all. I'm just getting into Access, so I am still learning pratically everything. Here is my issue-

To learn Access (2000), I have created a very simple database (from scratch) for creating a grocery shopping list.
The database works very nice and is useful to creating a shopping list. I created a table of grocery items with a YesNo field indicating that the item is to be put on the grocery list. I then created a form that shows the stores (that I shop at) with a subform that shows the grocery items on the list. The subform can be altered so I can check the box (for the YesNo field) for the items for the grocery list. Then I print a report that displays the grocery list based on the Yes in the checkbox.

What I would like to do is to be able to clear the check boxes all at once when I create a new gorcery list. This way I do not have to go through 50 items and manually unchecking the boxes before creating a new grocery list.

Is there a way to do this? I appreciate any responses- I am a hardware troubleshooting pro, but not fluent in programming- So please go slow !!!