Correct procedure?

My problem is with Hungarian birth surnames which have supporting documents to confirm the alternative has been officially registered
Roy

Almost a week has gone by and no one has submitted an answer.
Perhaps curators don't know either!
Roy

Maybe I'm assuming wrong, but this sounds like just using the birth surname and last name field for the male would work ?

Thanks J C K, because that is what I have been doing, whereas a colleague continually presents the first and changed names in the last name field only separated by a hyphen.
I contend his recording is incorrect for it appears as if the individual lived their entire lives with an aristocratic double barreled hyphenated surname, which is not the case.

I had hoped a senior curator would have offered experienced guidance on this, but perhaps my concern got overlooked.
Roy