Hi there,
Thanks for posting in the Community. I'd be happy to answer your question.
If you make changes to a previously reported period for your GST the adjustments will show up as Exceptions in the current period. For more info on filing and paying the GST in QuickBooks, I encourage you to check out this helpful article article: File and pay Tax/GST. Let me know if you have other questions. I'll be on standby. :)