Processing > Processing Context Menu > Copy Process to Similar

Be aware that the button will in fact say Copy Milling Process to Similar or Copy Cutting Process to Similar or something else depending on the type of process you have selected.

This allows you to make changes to the processing of one part and quickly apply the same changes to all other parts of the same type that are also on the plate.

Select the path that contains the processing you have modified. It is critical that you do not select the leads or any other entity. You can select only one path for which you would like to duplicate the processing.

RIGHT CLICK and select Copy xxx Process to Similar.

The characteristics of the selected path will be copied to all paths that have the same characteristics, see Select Similar for how they are selected. Where you are dealing with a large number of parts and there is the potential for leads to be placed on top of paths it may be prudent to use the check leads function after copying processes.

See:

Copying Processing