Why does it ask for the original invoice number and date?

Rule 53 of the CGST Rules requires a credit note to reference the original invoice it's adjusting — it can't stand alone as an independent document.

Does this file the credit note with the GST portal?

No — this generates the document itself. You (or your accountant) still need to declare it in your GSTR return for it to take tax effect.

Documents

Create a GST credit note (Section 34) referencing an original invoice, for returns, discounts, or overcharges.

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1
Enter your business details, including GSTIN — required for a valid GST credit note.
2
Enter the buyer's details and the original invoice number and date being referenced.
3
Choose the reason (sales return, discount, overcharge, etc.) and list the items being credited.
4
Generate and download the PDF for your records and your buyer's.

Why does it ask for the original invoice number and date?: Rule 53 of the CGST Rules requires a credit note to reference the original invoice it's adjusting — it can't stand alone as an independent document.
Does this file the credit note with the GST portal?: No — this generates the document itself. You (or your accountant) still need to declare it in your GSTR return for it to take tax effect.