The provided sample universe can be used as the core universe and enhancements should be developed in a linked universe.The universe development can be split between SAP (core) and your own (linked) version. Using this approach, a new version of the sample universe can be easily propagated to the linked universes.
We will provide more information about this approach here.
Create a linked universe
Create a new local project in IDT
Create linked Universe from Core Universe
From the Repository Resources select the exported BI platform CMS system database universe to create a linked universe.
Select the local project and press Next
Select the option 'Use the same connection with core universe' and press Next
Enter the name BI platform CMS custom for Business Layer and Data Foundation press Finish.
The linked universe is created in your local project.