Making a new dotCal calendar in your workspace is easy.

First log in to your calendar.

Then click "NEW CALENDAR" on the left and fill in the blanks.You can also make a new calendar by mashing up existing calendars. Click "NEW MASHUP", Give your calendar a name, and a category if you like, select the dotCal calendars in your workspace you want included, and your off.

.... But remember, Mashups are not editable, the local sources for the Mashups are.