Hello @Lea2978
You don't appear to have any experience as a host yourself which is probably leading to this confusion on your part.
The owner /host should set up the listing under their own profile and add you as a co-host to their listing where they can set up for you to be paid in line with your contract with them.
As for client 1 it's a new listing with I presume no bookings you can just delete it from your account .
copy and save text and images from the listing on your profile share with client 1 and he can set up his own listing and add you.
you can follow same set up approach with client 2.