Importing several .ics files into one calendar

Hi,
I know that you can import a .ics file and create a new calendar in Team Calendars. I was wondering if it would be possible that after a calendar has been created a second .ics file could be imported to add additional events.

What I'm thinking is that when you click on the drop down menu for a calendar there could be an option to add additional events from a .ics file.

Since CalDAV is presenting alot of issues, being able to import additional .ics files to a calendar I feel would put out a lot of fires with customers.

Currently I am creating new calendars on a monthly basis to update one of our calendars (we do this to include all the webex & teleconference data). Any subscribers to the calendars then have to re-subscribe.

I had come across a work around on one of the tickets to create a google calendar and be able to achieve this but since everything in our company is behind a firewall this is not an option.

Having this option would be a great alternative to having a fully synced calendar from outlook via the CalDAV protocol.

Thanks for the time and consideration,
-Aaron