Click an object to open the options for its construction history, or RMB-select an object to show information about its geometry and highlight construction history dependencies.
Access this tool from the Object Edit tool palette:
This tool has two uses:
Press the to edit the construction history of an object. For example, click a surface created with the Rail Surface tool to open the options window for that surface.
Press the to show statistics on an object in a floating window and highlight construction history dependencies: