You Can Now Add Multiple Appointment Links to Location Panel Through GMB
https://localu.orgGoogle has updated the Appointment Link field in the GMB dashboard to allow for more than one link. There does not seem to be any restrictions on the number of appointment links you can add right now.
Also, only the root domain is displayed with no way for the listing owner to differentiate the links from each other. If you would like to point potential clients to different appointment forms on your own site for specific services for example, all the links would display exactly the same.