hi
you can use the function of zero shift G54
means that you can poistion your working table or working head (according to your machine type ) to a certian position manually then notice the reading of x and y values and write down in paper and go to zero shift page and write down this values in first line which should be the code G54 then when you use the code G54 in your program all diamensions which you will use will be relative to the new zero shift G54
FOR EXAMPLE YOU WILL USE in your header of program G54G40....
regards
ahmed