Plate Breaks are a feature intended primarily for routers. The enable the milling (routering) process to be led away from the cut, usually towards the edge of the plate, so that the routering process severs the skeleton to the plate edge as it is proceeding around the parts. It thus provides a form of Skeleton Breakup on routers.
A plate break can be added anywhere on a milling process. After adding it, when the milling process is selected, there will be handles to allow manipulation of the plate break.
The example below shows a ring being routered from a plate. At the top left we leadin from the edge of the plate. At the bottom right there is a plate break of width 10mm.
Plate break at approximately 4 o'clock, extending down to the plate edge.
Plate Break handles: At top handles to delete and adjust the attachment location, at the bottom right a handle to drag the end of the plate break.