How to Add "Account key cash allocation" field to Billing type "F1"

Hi Experts,

I want to add "Account key cash allocation" field to billing type F1, so that I can use that as a reference to create some billing types as per client's requirement. Although, this field is active in "BV" billing type, I cannot take that as a reference, since it is order related billing type. Also, I want the same "Account key cash allocation" field in cancellation, returns and credit memo Billing types.

Thanks in Advance.