How do I do a manual adjustment to my GST when lodging my BAS through Quickbooks portal

I appreciate your time visiting us here, jnahuysen.

I'd like to clarify, did you mark the BAS as lodged? If so, this will close the books for this GST period. Changes on your transactions from this period will show in the GST exception report later on. To adjust the GST amount without making any amendments, you can request to unlodged your BAS. To do this, simply contact our Customer Care Team by following these steps: 

1. In your QuickBooks Online, click the Help menu in the upper-right corner.
2. On the Search tab, click an article and select Contact us at the bottom. Then, enter the details of your concern.
3. Choose how you would like to connect with them: either via Callback or Chat.

Please check this article for our support hours: Get help with QuickBooks products and services.

For more information about lodging BAS, here's an article that you can read: Lodging BAS and IAS. To view other guides and articles, feel free to check our general help topics page. 

Please keep me posted on how it goes. I want to ensure that you're able to get back to running your business. Take care!