Employee has several job roles

Summary

is it possible to add a secondary role to an employees employment information?

Content

We need to be able to track and report persons additional roles e.g their primary role is a sales person, but in addition they work as a trainer.

Ideally this information would be stored in employees employment information, but would also be visible in the directory  and transferrable via integration to other systems.

Has anyone faced a similar situation and how has it been resolved in the system?