I have a scenario:
I have posted a credit note with wrong quantity. After I revised the credit note and post it again, i will have 2 invoice number.
Is it possible to consolidate 2 credit note into one? Please help
No it is not possible. You have a posted legal document with a unique identifier, you will have to have "undone" this with an invoice depending upon how you processed it, and the second credit note remains - you would apply the correction to the original to close it off. What you cannot do is combine two posted transactions into one new one - it is posted.
What do you mean "undone" this with an invoice depending upon how you processed it?
Undone through adding a line to the invoice, adjusting with miscellaneous charges, creating a financial entry, processing a sales return and crediting etc etc - depends how you are now adjusting the error.