creo4 Drawing Setup option documentation for: USE_MAJOR_UNITS 
(Also MBD)
sketcher_set_grid_y_spacing
Category: Sketcher
Description: Enter a y-grid spacing value to override the default y-grid spacing value.
Values:
Default Values: 1.000000
able Settings:
arrowhead*
dot
filled_dot
no_arrow
slash
integral
box
filled_box
target
half arrow
triangle
figuration setting remains the same
within the model.