Workflow action: Delete one of this job's sub-jobs
This workflow action will delete a single sub-job (that you select) as opposed to the entire job. You would use this on a multi sub-system workflow system where you have jobs with multiple sub-jobs and you have a progress button in the workflow to reflect the fact that one sub-job is not necessary. The overall job and other sub-jobs will remain active.
An example here might be a two sub-system workflow for Accounts and Corporation tax, you might have all clients active on Corporation tax and then at an early stage ask them if they would like your assistance, if they say No then you can click a progress button that deletes that sub-job.