Japan use of a different scale for fine woodworking

The unit requires the UNIT SYSTEM in Metric but UNIT SCALE to be 0.3300. This works but I need to change CM to Sun. The three units use the Shakkanuo definitions which are Shaku (1.0) Sun (0.1) Bu (0.01) Rin (0.001) and Mo (0.0001) I am only working to Sun with its decimal. In Japan the dimentions might be called out 3sun-2bu which I will simply use 3.2 sun. Now I have to remember what the unit is for it is displayed as 3.2cm