I got your point, @feprimafi. I'll hop in this thread to share some pointers concerning the matching feature under the Banking section in QuickBooks Online.

You may utilise the Add function within the Banking section in QuickBooks when you haven't yet created any transactions within the platform. That said, you can add them directly as your reconciling items, it won't cause duplicate.

On the other hand, when the invoice was created and marked as paid, the corresponding bank transaction should ideally be matched to it within QuickBooks Online. It ensures the payment is reconciled with the invoice, preventing duplicates and maintaining accurate records. 

Furthermore, you'll want to make sure that your bank transactions are coming into the accurate accounts, you can use this Bank Rule feature as it categorises transactions automatically. If you are interested, you can visit this article: Set up bank rules to categorise online banking transactions in QuickBooks Online.

I'll be here if you need assistance with reconciling your account. Add it to this thread, and we'll ensure to guide you. Have a fantastic week, feprimafi.