Hello Christian,
the copy-package functionality (shift namespace) is planned with upcoming B1iF 9.0 pl13 and B1iSN9.0 pl04. The functionality will be accessible via Scenarios -> Package Design -> Tools -> Copy Package.
At the moment, please create a new package in the customer namespace and copy your scenario step(s) via (Scenarios -> Step Design -> Copy). Assign the copied step(s) to the newly created package.
Best regards
Bastian