I did something like this recently to my cabinets so that I could drill pilot holes for screws with the cnc. One method is to use user parameters to drive a pattern based on the height of the cabinet. First create a parameter for in this case the height of the cabinet. Then create a parameter for where you want the pilot hole to start, then make a parameter for the spacing of the holes. Then create a parameter without units to calculate the quantity of the holes for that distance and use "floor" "round" or "ceil" to round off the parameter for you. Then create a single hole in the cabinet and use that for a pattern. In the pattern use the parameters you created and when you change the height of the cabinet the number of holes will change with it. I hope this helps! if you need more clarification I can provide a screen cast later.
