At my home-airport the LH-staff will do almost everything (combine/split...whatever) I ask them to do with VDB-vouchers (I assume ou talk about these).
Not sure about the actual rules, but nothing in the terms&conditions says that these are non-transferable, so I would expect that you at least can have tickets issued in anybody's name. Not sure if the bearer has to be present officially, but in my case nobody bothered that she was not.
Greetings - Dirk