Converting universal measurements

Converting universal measurements

I don’t understand why the system does not offer the conversion automatically of a unit into a sub unit or other fixed equivalent like feet, inches, meter and centimeter. Eg. if I produce 12 meter long cables, I can sell them as a unit or I can sell them by length, but once I set up in unit group the conversion the one cable = 12 meter I would appreciate the system to automatically offer to select = 1200cm =472.441 in = 39.37ft etc…instead of enter all of them manually with the possibility of errors