If your toolpath has multiple Z levels, you can select this command to move the tool to the end of each level. If Stock is defined, the cut material simulation at each Z level is displayed.
Note: To access this tab activate (i.e., double-left-click) on a loaded g-code file from the Project tab. |
click: 
 G-Code Browser: Simulate, Step Levels menu item |
1.Select Step Levels from the Simulate tab and the simulation will advance to the end of the current Z level. |