In fact I try this and didn't work, because the evolution-webcal was not installed. So I opened YaST and installed.
Then I used the command to search the path of webcal and them the command to include the new google calendar.
Code:
/usr/lib/evolution-webcal/evolution-webcal my private URL
Everything work ok. Even now, if I try to put the calendar will say that the calendar is already assign. But, I CANNOT see the calendar in Gnome calendar. Should be working but is not working!
Everything is correct, everything goes ok, but at the end i cannot see my appointments.