There is no difficulty if a corporate hierarchy has been entered and a survey has to be conducted for several companies because the assessment matrix and the configuration of assessors and assessees is always generated from the relationship, superior/employee or colleague/employee. The company/subsidiary is not taken into account in this case. In particular, this covers the requirements of SMEs where superiors are often in charge of teams spread across several locations.
If you wish to conduct a survey for each company, then you will have to create a survey for each company or register each company separately.