How to unmark a bas statement

Hi topiarymadness-o,

To unlodge a BAS you can contact an accountant user or support team for further assistance. 

You can find the contact details here: Get help with QuickBooks products and services.

For your reference, you can also check on this article: Unlodging a BAS as an Accountant User. 

Thank you and please let us know if you require any additional assistance. Have a nice day.