"Material Cutoff" command

Hello,

Operating a MultiCam Apex3R router and was just curious if anyone is familiar with the manual cropping or "material cutoff" found within the Cut Utilities of the menu on the controller. (Menu > Cut Utilities > Material Cutoff)
In the user manual it describes this command as follows "The Material Cutoff function allows the operator to manually cut off the remainder of the material based on X and Y input. This function does not work from a Soft Home but starts at the current Jog location and ends when the operator stops the motion." Just curious what peoples experiences with this is and or could walk me through in a little more detail.

Thanks,

cpnagle_cnc