You can use the Modify Sub Elements tool to manipulate one or more of the points or edges on a selected element. 
 Video: Shape Editing Elements
Video: Shape Editing Elements 
Note: Shape edited elements may contain many points. Consider turning off the display of shape edit points on preview and selection to increase performance. 
  
Click Modify|<Element> tab Shape Editing panel drop-down
Shape Editing panel drop-down (Preview Points).
(Preview Points). 
  
  For additional information see: 
	 Show Shape Edit Control Points.
  
 
 
Note: For ease of editing, consider disabling snapping to internal points and edges of the shape edited element.
Click Modify|<Element> tab Shape Editing panel drop-down
Shape Editing panel drop-down (Snap to Editor Points and Lines).
(Snap to Editor Points and Lines).
To Modify the shape of an element:
- Select the element to modify. 
  
- Click Modify | <element> tab Shape Editing panel Shape Editing panel Modify Sub Elements. Modify Sub Elements.
- Drag a point or edge to modify the location or elevation. 
	 
 
	 Note: If you place the cursor over the element, you can press 
		 Tab to pick specific sub elements. Standard selection methods also apply. See 
		 Select Multiple Elements. 
	  
 - Elevation of the point or edge is displayed when selected. The elevation reported is based on the Elevation Base setting on the Modify Sub elements panel. 
		
- Dragging a blue arrow moves the point vertically. 
		
 
- Click the text control or use the Elevation box on the Modify Sub Elements panel to enter a precise height value for the selected point or edge. 
	 The value of the height represents the offset from Elevation Base. 
	  Note: For an edge this means that the center is moved to the specified height, but the relative heights of the 2 ends are maintained.