I have an assembly of piping with pipes of various diameters and lengths. For every pipe length, I have created a configuration with the name being the pipe length and this in inches. In the assembly drawing, I have used a balloon annotation for every pipe, and which contains the custom property of the configuration name, basically giving the pipe length. Now I need to express all those lengths in mm. Is there a way to do that? The pipe length is the depth of an extrusion. Is there a property or formula that will give me the extrusion depth and show it in the annotation balloon, so changing the custom property or any information in the balloon to give this? SW2013.