OnTheButton provides a job-share facility; this allows 2 (or more) people to share a particular role, eg PT Home Economics, DHT pupil behaviour. Job-shares provide a mechanism for promoted members of staff to share a job. The job-share can be used in the escalation path of a referral.
The job-share allows staff who share a job to be grouped together, eg so each are kept informed of referrals to them.
If you wish to have 2 or more teachers share a class this is done by allocating more than one teacher to the class, ie you do not need to use job-share.