If a region has an 
  assembly offset specified, you can edit the horizontal and vertical baselines and station start and end for the offset. 
- In the drawing, click the corridor, then right-click and click 
	 . 
  
 
- In the 
	 Corridor Properties dialog box, click the 
	 Parameters tab. 
  
 
- To change the horizontal baseline for the offset, click the 
	 Horizontal Baseline field. Select the horizontal baseline in the 
	 Select a Horizontal Baseline dialog box. 
  
 
- To change the vertical baseline for the offset, click the 
	 Vertical Baseline field. Select the vertical baseline in the dialog box that is displayed. Depending on what you select for the horizontal baseline, this may be either the Select a Profile dialog box or the 
	 Select a Vertical Baseline dialog box.
	 
Note: For offset baselines, the vertical baseline can be comprised of a different alignment/profile or feature line than what is specified for the horizontal baseline.
	 
   
- To change either the start or end station for the region, select either the 
	 Start Station or 
	 End Station field. Enter the station number or click 
	 
 and select the station in the drawing. 
   
- Click 
	 Apply.