Just wondering about
The base calendar for our CA PPM is Chile calendar, then to upload, for example, a Brasil project , in many cases original dates changes because apply base calendar (Chile calendar in this case). How can I do to get the right dates in our gantts?
As Samik writes in CA PPM there is only one single calendar for projects. That is the base calendar.
What you describe should not happen unless you autoschedule the project.
The base calendar for our CA PPM is Chile calendar, then to upload, for example, a Brasil project that should still use the Chile calendar and no dates should change if they are working days in the Chile calendar.
Open a case with support.
Edit
On the other hand any project you reate will be using Chile calendar and not eg. Brasil calendar. Only resousres can use different calendars