You can edit certain aspects of a building block geometry by clicking on the 'Building model options' icon while at the block level. This opens the Model Options dialog box:
At the block level, the Block tab on the Model Options data dialogue box is enabled and allows you to change the Form of the block and to modify pitched roof assignment.
To change the form of the current block, make a selection from the 'Form' drop list. When you change the form of a block from an 'Extruded' form to 'Pitched Roof' or 'Sloping Walls' the original form will be remembered so that even if you have edited the block by cutting it or dragging a face, when you convert the form back to 'Extruded', the original form will be restored.
The Pitched Roof/Wall Construction Transition settings allow you to control which elements within a block will be assigned pitched roof construction, either by disallowing pitched roof construction altogether or by adjusting the element slope to determine which elements should be identified as pitched roofs. The 'Roof-wall transition angle' is the angle from the horizontal below which the element will be considered a roof.