While we are developing solutions for customers we iterate our design. So old Cases have the old design, new Case get the new. We would like to remove all of the old completed Cases. Is there a documented way to delete Case like these?

Take a look at this...

Deleting a case - IBM Documentation

It documents a "1 at a time" manual process and caveats using in a Production environment.

There is also the option of resetting the test environment...

Resetting the test environment - IBM Documentation

In the end we developed a custom case solution that allows you to specify a set of cases to remove and provides "2 pairs of eyes" checking, a dry-run capability, etc. as none of the above options really worked for us and our customers.

Good luck!

Regards,

Dave.

Thanks Dave I have found those technotes too. Not great solutions.