A warm welcome to the Community, ECO ELITE.
I can share some information regarding deleting an invoice and subsequent deductions in QuickBooks Online.
Are you trying to delete an invoice with GST deductions? If so, you can go ahead and delete the invoice transaction. This will leave a GST credit and you can process a refund to claim it.
To help you manage your invoices with GST in QuickBooks Online, you can go through the following article: New GST Return: It’s Simple and Has A Single Return. This will provide you more information about handling due date, missing, and pending invoices. Also, you can get a detailed explanation about the amendment of invoices.
Additionally, you can check out this article for the steps and instructions in claiming a GST refund: GST Refund Process: How To Claim GST Refund?. This article has in-depth details about time limit for filing a refund as well as information on when you can get it.
If I can be of assistance while working in QuickBooks, please let me know. I'll be around to help you out.
