You can't transfer a listing from one host to another - the owner of the property should have told you this @Lynda429
as mentioned in my earlier post you need to set up the listing in your name and add any cohost whose helping you manage things locally as your cohost.
what arrangements did you make with the owner for any existing bookings they may have . You will need to block out any dates in the calendar of your new listing for when they have bookings .
to avoid confusion the person who helps you with bookings is a cohost not a host.
the owner is the host .
the cohost who is managing things locally should know you can't transfer bookings .