creating global calendar

[NewsGroup]

I have MS Proejct connected to my server.
I have created a sample project with a base calendar.
Now I want to make the base calendar available for all projects.
So I used the organiser to copy the base calendar to Global (+cached
Enterprise).
When I clicked copy I get the following message,

'Base calendars cannot be added to this project.Check out the Enterprise
Global template to add or edit Enterprise Base calendars. If the server
allows local base calendars, you can copy those calendars between projects
but not into the Enterprise Global template or projects containing checked
out enterprise resources.'

I tried without connecting MS Project to the server also.
Still I get the same problem.

How do I copy the base calendar to global in order to use it in all project
plans I create in future?

Meena.