A pupil's Learner Enrolment Status defaults to 'C - single registration at this school' but can be altered from the Edit Tab in the Pupil Profile.
Navigate to and open the 'Extended Pupil Details' area where you will find a Learner Enrolment Status drop-down (this can also be edited in bulk by choosing the appropriate option in Multi edit)
This can be changed to either 'Current Main (dual registration)' or 'Current Subsidiary (dual registration)'
In terms of how to enter attendance for such pupils, please refer to the census guidance:
4.3.8.8 Dual registration
Measures are in place to avoid the double counting of attendance and absence for
pupils who are registered at more than one school (referred to as dual registered).
Each school marks the register – present or absent – for the sessions that the pupil is
due to attend their school only.
The remaining session(s) where the pupil is attending another school are marked in the
register using code ‘D’, which is now also included in the census return.
The number of ‘sessions possible’ for a dual registered pupil against the main school
exclude those where the pupil attends the subsidiary school and vice versa.
Updated