About customizing right-click menus:
You can create a custom right-click menu for Smart Construction. The sample project delivers several samples to demonstrate how to create custom menus for component registers, drawing or models in a viewer, or any toolbar menu item. For more information, see Create a right-click menu item for Launching a URL with arguments.
Location of sample project and readme:
[Drive]:\Program Files (x86)\SmartConstruction\2019\Customization\Samples\SPC_CustomClientModule\SPC_CustomClientModule\CustomClientAPIs