Can I delete prepayments? And how does this effects the Vat

Hello, can I delete prepayments?invoice has been entered in the GL account then reversed from GL account to 1103 so this process completes the the step 2 of reversal of prepayments. Then we carried out the with step three to post the monthly prepayments adjustment by entering them into journal. Invoice was dated January 22 and was for annual subscription-12 months. Six months down the line we have received credit note for this invoice as the company current assets were purchased by another company the liability changed and so the invoice was reissued by the vendor in such way where the first two months was billed to the old company and the remaining ten months was being billed to the new company. On receipt of the credit note I have off set it against the original invoice and so I believe all the adjustments has been cancelled. However, how do I process the two new invoices related to this annual subscription? Do I follow the same prepayments process as mentioned above when entering the two new invoices?