Maximus Custom Variables
Custom variables in Maximus
Before setting up custom variables, via Model Variables, check that it is not already available within Maximus as a number of variables are competed but not displayed.
To see a list of computed variables either navigate to Global_>Customize Profile Results of press Shift+F7 and the dialog below will appear.

Select the variable(s) required and Add ->. These will then appear in profile results for a pipe.
If the variable required is not available and you know the equation to compute it, then it can be added as a Model Variable. See the Maximus help system for details on how to do this.