1) OK. We saw must have 15 properties to use OR to sync (don't)
On Flipkey, they allow syncing with other calendars
2) So on a property calendar, they have:
Rent on other sites?
Sync calendars with Airbnb, HomeAway, Google and more > Import button >
> "Events from your chosen calendar will be sent to your Tripadvisor calendar automatically."
> VRBO/AirBnB/Google/Other buttons (to paste a link to other calendar
3) So since you handle vrbo, bdc, abb - how would I sync that FK calendar with one on OwnerRez? Should I use an OR link or one from the OTA?
Select the 'Other' option and then put in the calendar export link from OwnerRez.
Here's a step by step guide for TripAdvisor, both importing and exporting calendars:
https://www.ownerrez.com/support/articles/channel-management-calendar-import-export-tripadvisor