I have a coil of tubing that I need to solve for the oal of it. I have defined a new custom property oal. What I need is to take the mass properties value and divide it by the weight per foot of the tubing. Very simple. Is there a way to do this in the custom properties? I tried number and text but neither seems to work. I was able to make a global variable and do the math but this does not show up in the custom properties when I open it. I have many configurations so the value has to calculate each time. Global variables scares me as well.