SAP PS (Project System) integration With PPM (Portfolio and Project Management)

Hello,

I am new to the issue PPM, so I have some questions:

Is there any possibility to import all SAP PS projects to PPM in one step.

In SAP Help is mentioned the function of importing one PS project to PPM.
But I have the request to import all PS project we have in our system (about 1500).

We want to start to use PPM in our company.

How can I import all PS projects to PPM? Is there an guide or documentation?

Thanks in advance

Andreas Hofmeister