Calendar

I have a need to do one of two things:
1. Sync my OTM calendar with my SAP calendar. My SAP calendar is much more detailed than my OTM calendar and I would prefer not to manually add every SAP calendar that I have (including modifying the holiday schedules every year for every country in my supply chain).
2. Find a better way to update my calendars in OTM than doing it manually, by country.

Any insight to this topic would be greatly appreciated, thank you!