In the Main… found in the Weight group menu in the main window, the user can select the main group to work on.
Usually the Lightship or Displacement will be the top weight group, but in some cases as when dividing the project on several projects, one project might only work on Machinery and other just on Equipment or Hull. Selecting the appropriate level in the Main… window will reduce unnecessary clicking in the breakdown structure.
Also selecting another top weight group than lightship/displacement will affect many other functions in the program, for example weight distribution. Selecting Hull as the top weight group, and viewing the weight distribution, will give a distribution only for the hull.