To rotate a section plane numerically
- Click Sectioning Tools tab 
Mode panel 
Planes 
.  
- Click the Current Plane drop-down on the Planes Settings panel, and select the plane you want to use, for example, Plane 3. 
This plane becomes the current plane. 
  
- Slide out the Transform panel, and type in numerical values into the Rotation manual entry boxes to rotate the current plane by the amount entered.