Erase areas are created by entering the size and position of the coverage area. It is possible to define 1 Rewrite Area and will appear in a preview window in the right hand side.  The 'Area' will appear as aGrey polygon as you define it.

1)

Define the size (height and width) of the required coverage area (or hole) and it will be displayed as a rectangle in the preview window - use this rectangle to gauge the height and width values correctly.

2)

Move the rectangle to the required position. Positioning is based on a grid reference using an X (left/right) and Y (up/down) axis and moving in units of pixels (Tip: there are 11.8 (approx. 12) pixels per millimetre (mm)). Use the preview as a guide while increasing/decreasing the X and Y values.