How do you delete the Paypal option and change it Purchase Order withou

How do you delete the Paypal option and change it Purchase Order without losing all of my information of products? Because I have all my drop down options already established and don't want to have to re-enter all the information.

You can just to click on the Trash icon to delete the PayPal integration. Then you will be able to add the Purchase Order payment. All the products will be restored once you add the Purchase Order payment.