We want your Yamdu to reflect your ways of working. If the exact position you need to assign to a new user does not exist in Yamdu's positions list, then simply add a custom position.
Go to Crew and click Invite User or to Access Rights if you want to edit an existing user
Select the most similar available position to the custom position you wish to add
Adjust the access rights if needed
Enter the preferred position name in the Custom Position field
From this point forward, the custom position will the displayed for the user in question throughout Yamdu.