You can transfer a property to a different customer and keep the records associated with that property.  From the property profile page, you will click on the "Assign Customer" box.  This will create a drop down showing the current customer the property is assigned to.  You will unclick the owner to unassign it and then type in the name of the new customer in the search bar of the same drop down.  Click on that new customer's name to assign it to them and then click "save" at the bottom of the page.  This will prompt a box to appear asking you some questions on what you'd like to do with the records of that property.  Select the appropriate toggles and click "continue" and the property is now assigned to the new customer.

If you are needing to create a new customer, do this first by adding a new customer but not entering anything when you come to the page for entering property info.  Just click on the properties tab on the left of your screen when you come to that page and it will take you back to the main properties page.