If you want to create accounts for staff members who are not teachers, these accounts would still have to be created as teachers first. This is because Sdui generally only differentiates between the following account types: pupil, parent and teacher.
As soon as you have created the account, you can assign the person a different user role via the user administration. To do this, call up the person's profile and click on "User roles". Deactivate the "Teacher" user role and select another role instead, such as "Secretary".
If you wish, you can remove the person from the "Staff room" group. Accounts that are initially created as teachers are automatically added to the "Staff room" group.