After adding fascia, you can add and remove segments, flip its orientation, and resize the fascia. 
To add and remove segments
-  In the drawing area, select the fascia. 
 
- Click Modify | Fascias tab
Roof Fascia panel
 (Add/Remove Segments).  
- Click a reference edge to add a fascia or remove a fascia. 
Watch the status bar for information about valid references. 
  
To resize roof fascia
-  In the drawing area, select the fascia. 
 
- Move the drag controls to the desired location. 
 
To flip roof fascia
- In the drawing area, select the fascia. 
 
- If you are in a 3D view, click the flip controls that appear to flip the fascia around the vertical or horizontal axis. 
If you are in a 2D view, right-click the fascia, and click Flip About Horizontal Axis or Flip About Vertical Axis.