For example I require a consultation for new clients. I dont want new clients to be able to book just any service, however I do want existing clients to have the ability to book online but I want everything conveniently bookable online. I started with only having initial consultations bookable online but since there is no way to separate the services that left current clients with no way to book online. Luckily my website has a system for booking appointments, so I now have new client consultations available to be booked online through my website. Then I had to make a client portal accessible only by password that I provide to existing client which is where I connected the blvd booking widget.
It also meant I had to connect the different calendars to each other to prevent double booking. It works but is a massively roundabout way of doing it.