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We're glad to have you here, joneill1186

It's a delight to help you set up cost amount into four decimal places in QuickBooks Desktop. Please follow the steps below to learn how:

1. Go to List.
2. Click Item List.
3. Double-click the item.
4. Enter the your desired Cost and Sales Price.
5. Click OK.

I've attached a screenshot for your reference.

You can also check out this article to know more about editing items in QuickBooks: Add, edit, and delete items.

Feel free to leave a comment below if you have further questions about QuickBooks. I’d be happy to help.