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