IS-Media: data transfer from one order type to another order type

Hi Experts,

I have below issue. appriciate immidiate reponse.

IS-Media:

We have order type "EPAP". In this order type, there is no "liability account and Amortization process".

We have order type "SUB". In this order type, there is liability account and amortization process.

Now, business wants to move all EPAP orders to SUB. Now we would like to know how the liability account and amortization process takes place.

Small example:

Business partner A paid for EPAP for one year. lets say amount is 12000. assume this BP now having 6000 Credit balance. Now we would like to take this balance to new order type under "SUB".

We are more concern about the how liability account and amortization process happens in order type "SUB"

I request experts to share their experience. Looking forward to hear.

Thanks in advance.