Is possible to manage a "global reference id", therefore all process h

Does not the process instance id already supply you with this unique information? As far my knowledge goes, a new id will always be generated for a new process instance.

Yes, I know that amirula. But i want to a new "global id", that all process can reference it in the reports, to make a general portal report for all instance process.
For example: Process Name - Start Date - "Global ID" - etc...

This "global id" is a pesonalizable variable that i have to initialize at the beginning of the processes in the model, and then show in the portal reports for all process.

If you want to identify each instance through some Global ID, Here are some ways:
1. If you have any primary key corresponding to each process, add that as global ID.
2. Have a constant and use Increment Constant or Update Constants Smart Service to maintain Global ID which is unique to each process.

Thank you sonias! Is a good idea. I will try this.