English to German Bus/Financial Management correct translation of a specific type of management

Hi! The text I'm translating describes the process of merging companies, for a presentation in Germany for corporate managers. It specifies factors that influence the success of the merge, like the support of top management. Then it lists 'line management'as a factor. I have found the translation 'Linienemanagement' (also here on proz.com), but am wondering if that is a commonly used and comprehensive german business term, ad if something like 'Geschaeftsbereichleiter' wouldn't be clearer.

context:
'Six main categories of investigation were identified: top management's support, line management's support, factors related to the HR function and HR managers, and external and internal factors.'