Adding multiple Properties to a Viewing

I want to be able to create a viewing schedule or tour that allows me to associate multiple properties with the same viewing,

I would like this to sync to my preferred calendar (e.g. Outlook/Gmail),

So that all my viewings can be stored in Kato, preventing the need to store viewing tours directly in my work calendar.

This will centralise my viewing information and improve organisation by keeping everything in one place.