Maestro Korolev set up this development tool report: it saves your global class in an XML file and rebuilds it from that same file. Take your re-usable global class coding with you wherever you go...
Now do be careful - coding like this needs to be updated and you have to assume it hasn't been updated for quite a while. On the other hand: it may just work fine !
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Why not carry along your own class coding as local class ? That's exactly what I do: I compose reusable coding in local lcl_class form and place it in an include. It's easier to bring along and has less impact on the overall system. But then, a globally defined class is easier to find and more inviting to re-use. Many many ways to Rome...