Appointments+ Shortcode

Hi!
I have three different services, each with a different provider. I want to make three different calendar pages which display the default service and provider for that calendar. How do i alter the shortcode to do this? I just dont want to have dropdown options, i want each page to default to one options.. i know there is a way to do this with IDs, but i dont know the format of the code.. any help would be MUCH appreciated. THANKS!!!!