To set an attending or attendings in a resident's rotation schedule:

Limit List of Attendings by Rotation
The list of attendings can get lengthy. You can limit the list of attendings to only those attendings assigned to a particular rotation.
Auto Assign Attending
To further limit the amount of time spent selecting attendings for rotations, you can automatically assign attendings to a rotation.
Auto Assign Attending on Rotation works best in when each rotation has one attending. If you have selected multiple attendings, they will all be automatically assigned
When the rotation is selected in the Manage Resident Rotation window, the attending or attendings will automatically be assigned to them.