You should give it to a companion with a high stewardship skill.

Quartermaster is related to the stewardship skill.

A better surgeon means that your troops have a higher survival chance and a quicker healing rate if they do get wounded.

Surgeon benefits from a companion with a high medicine skill.

If you don’t want to raise your own level, simply find a companion with a high engineering level and give them this clan role! This clan role should be given to someone with a high engineering skill level.

Engineer helps your army raise siege engines and take enemy fiefs.

This clan role should be given to a companion with a high scout skill to get the most benefit.

Scout helps your party detect tracks, get information from tracks, spot armies and units from farther away.

There are four clan roles in Bannerlord: Scout, Engineer, Surgeon, and Quartermaster. What are the different Clan Roles in Bannerlord? That’s right, you can take on a clan role yourself. In Bannerlord, Clan Roles will directly benefit from a companions skill level – or even your own. In Warband, their skills actively helped the party. They can do a lot! If you leave companions in your party, you have the option of giving them clan roles in Bannerlord unlike in Warband. You can keep them in your party, send them to lead caravans, be governors, lead separate parties, do quests for you, etc. You can do a bunch of different stuff with companions. In Mount and Blade II: Bannerlord, you will have the option of hiring companions to help you in your conquest.

Mount and blade healing