Unfortunately it is not possible to assign a certain property into multiple listing types.  If you want to assign a property to "for sale" and "for rent" listing types, we can suggest you to do the following:

Method 1

Create a new listing type and name it “For sale/For rent”. Then create a new price field in Flex and name it “Rent Price” . Then edit your desired property and assign it to the new listing type that you created and insert the sale price into normal price field of WPL. Then insert the rent price into the new field that you created.

This way both of sale and rent price will show on property details page.

Method 2

Why you don't add two listings for one property? It's very logical if you add two different listing for same property. One For Sale and another one For Rent.

Learn how to create/edit fields using our Flex Menu!