Eclipse and Pydev: a global “launch setup” for all files

I just started experimenting with Pydev and Eclipse for a small project.

My problem is that whenever I click run in the project entry point file, it works fine.

But whenever I am in a different file (and not at the entry point), he asks me to create a new launch configuration for this file, when I just want it to start from the entry point.

How can this be done, because for some time I ruined the properties in the absence.

Thank!