How to do a subject to deal

[Kennedy Williams]

I have a property under contract with a woman who still has a 40k mortgage on the property. And I have a buyer who wants to do a seller financing or subject to financing on the property after putting 5k down I am not sure how I should handle this. Should I just handle it as a lease option or are there any subject to contracts that I can use. All help will be greatly appreciated.

Thank You!