There are a number of ways to do this.

From 8.33 you can copy a job to a new job and tick the box to link it to the original job via a line item that is added to the new job.

You can also mark individual items as remakes when adding them to the job, by ticking the appropriate fault box on the add line item window. This will add a "REMAKE" label to the item on-screen and on the job ticket and invoice.

If the job has been submitted directly by the dentist via Procuur, then the dentist can choose a "change request" on the original order, and select it is a remake request.