This is the 7370th most frequent Russian word.
главбух
Chief accountant.
Here, 'главбух' is the main subject and is used as a noun to designate the person who performed the action of completing the report.
Наш главбух отлично выполнил годовой отчет.
Our chief accountant excellently completed the annual report.
In this sentence, 'главбух' represents the position being referred to, and it is used in the context of a potential appointment.
На собрании обсуждали назначение нового главбуха.
At the meeting, they discussed the appointment of a new chief accountant.
Here, 'главбуху' is the dative case of 'главбух', showing that the documents are to be passed to the chief accountant.