How to adjust the Debit note in the purchase bill & How to adjust the credit note in sales bills

I can help you adjust your debit note and credit note in QuickBooks Online, nak_eng. 

Thank you for reaching out to the Community. You'll just need to open the transactions, from there modify it and adjust the note.  

For more details about entering debit note and credit note, you can check out these articles:  

• How to create a debit note in QuickBooks. 
• Create and apply credit notes or delayed credits in QuickBooks Online. 

I'm just one Reply away if you need a hand in QBO related. Wishing you and your business continued success. Keep safe always.