Bitmap-Width
This property defines the width in pixels of the image displayed in the chip identified by the Item property. The bitmap strip identified by the Bitmap property is divided into several smaller images. The width of each image is the value assigned to this property.
 
Example - Modify a chip to include a bitmap
working-storage section.
77 icon-png pic s9(9comp-4.
77 wk-item pic 9(2).
...
procedure division.
...
  call "w$bitmap" using wbitmap-load "icon.png" 
       giving icon-png.
...
  modify screen-1-chip-1 item = wk-item
         bitmap icon-png
         bitmap-number 3
         bitmap-width 18
         .
...