How can I add a new tester to all existing testplan/ test packages?

Hi,

I am having around 40 testplans with 5 test packages on average. On January 1st we are getting a new tester who is supposted to get all test packages.

How can I add all existing test packages to him without doing it manually for every test package?

Is there any chance to do it according to the mass change for the attributes in sm_workcenter?

Thank you very much for your help!

Sofie