Unit conversion - Single unit

Unit conversion - Single unit

Hi
I'm trying to do unit conversion in zenon 6.51.
I have created a few units, and created a unit conversion function. However, this way changes ALL the created units, so if you create a button that changes Degree C to Degree F and afterwards presses a button that converts between liters and gallons, the function will change the degrees back to Degree C that is the standard unit.
Is there any way to only convert a single unit while leaving the others? VBA or VSTA?

This is a migrated post! Originally posted on 19.02.2013 by user brc. Please be aware that information can be outdated.