In AutoCAD, when managing sheets and layouts, different properties are used to control and organize sheet information. * Sheet Custom Property: This property allows you to define custom information specific to each sheet or layout. It is used for unique identifiers that are not globally applied to the entire sheet set but rather specific to individual sheets. * Setting the Property: * Open the Sheet Set Manager. * Right-click the sheet and select Properties. * Add a custom property for the sheet number based on discipline (e.g., C001). * Define the Custom Property: * In the Properties dialog, add a new property for the sheet number. * Enter the value (e.g., C001) for the specific sheet. Using a Sheet Custom Property ensures that each sheet has a unique identifier that can be easily managed and referenced.