I have one part designed with mm template and another designed with an inch template. I'm inserting both into an inch-template assembly. I want to use a named dimension from the former as an external variable in an equation for the latter. That dimension comes into the equation as a value in mm (in spite of what one might hope), and I have to divide it by 25.4 to convert the the needed dimension in inches. This is fine as far as it goes, but what if I don't happen to know the precise conversion factor?

If this were just an explicit number of mm, I could just follow it by "mm" in the equation, and the conversion would be done for me; but this doesn't appear to work for variables. Is there a built-in way of doing such conversions of variables within equations, or is there a better work-around that would use SW's own unit-conversion capabilities? -- John Willett

Sorry for being not clear. This is something I meant: