When you are linking your Clio calendar to Google, you will see this window:
You can choose whether to create a new calendar in Google or link to an existing calendar in Google. Below is an example of an existing Google calendar.
Choosing "Link to An Existing Calendar":
Do you want to merge your Clio calendar with a calendar you have in Google already? If the answer is yes, then you would choose to link to an existing calendar. To do so, select "Link to an existing Google Calendar" and choose it from the dropdown. The dropdown is a list of all calendars that exist in your Google account:
So now when you look at your Google calendar, your Google and Clio calendars will be merged into the one calendar:
Choosing "Create a new Google Calendar":
If you want to sync your Clio calendar with Google but you want your Clio calendar to be a stand-alone calendar (not merged with an existing one), then choose the option to create a new Google calendar. To do so, choose the radio button "Create new Google Calendar" and then name that calendar. In this example, I added "(Clio)" to the name so that it's easily identifiable as a calendar which was created by the Clio sync.
When you look at Google you will see that your Clio calendar is separate from your original Google Calendar: