Using Custom and Default File Properties in Equations You can include custom and default file property values in equations for parts and assemblies. To add custom and default file properties to equations: Do one of the following:Click Equations (Tools toolbar). Click Tools > Equations. Right-click the Equations folder in the FeatureManager design tree, and select Manage Equations. Select the Equation View . Select an equation, global variable or dimension. After = (equal sign), add a Custom Property, Function or File Property from the flyout menu.Icons differentiate the variables and file properties: Global Variable Custom Property Default Property Click OK to close the dialog box. Parent topicFile Properties Related concepts Summary Information Summary Information - Custom and Configuration Specific Blank Custom Properties Mass Properties and Section Properties Property Tab Builder Using File Properties in Equations for Configurations Equations Related tasks Properties