Hello there, MGT2013.
The following Mac Basics Knowledge Base article on Calendar and it's features:
Mac Basics: Calendar keeps your appointments
http://support.apple.com/kb/HT5978
In particular to your question this section is useful:
By default, OS X includes two calendars in the Calendar app – Work and Home. If you want to create a new calendar, choose New Calendar from the File menu. Type a name for your calendar in the text field. For example, if you have kids, you might want to create a separate calendar for each one to track their schedules. You can see and control how your calendars appear by clicking the Calendars button.
To change the color or name of a calendar, select it from the calendars list, then choose Edit > Get Info. To remove a calendar and all of its events, right-click or Control-click the calendar's name, then select Delete from the shortcut menu that appears.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.