You can use Interactive Feature Recognition to recognize features from curves that are generated from the model. Use this for features that are made up of too many surfaces to conveniently pick. 
-  Select Features & Manufacturing tab > Features panel > Features. 
  
 
- In the 
	 New Feature wizard, select a feature type. 
	 
You can recognize Pocket, Boss, and Side features with this method. 
	 
 
   
- Select 
	 Extract with feature recognition, and click 
	 Next. 
  
 
- On the 
	 Feature Extraction page, select 
	 Chain feature curves and click 
	 Next. 
	 
The geometry for the features is projected onto the plane of the UCS. 
	 
 
   
-  Select the geometry in the Graphics window to chain it into curves that represent the feature boundaries. Pockets and Bosses require closed curves. 
  
 
- Click 
	 Next. 
  
 
- Click 
	 Preview to display a wireframe preview of the features in the Graphics window. 
  
 
- On the 
	 Location page, pick or enter the 
	 Top and 
	 Bottom to specify the height and location of the feature. 
  
 
- Complete the wizard to edit the feature, or click 
	 Finish to use the default settings. 
  
 
To use IFR from a cross-section of a solid
 
  
  
-  Select Features & Manufacturing tab > Features panel > Features. 
	 
 
- In the 
		New Feature wizard, select a feature type. 
		
You can recognize Pocket, Boss, and Side features with this method. 
		
 
	  
- Select 
		Extract with feature recognition, and click 
		Next. 
	 
 
- On the 
		Feature Extraction page, select 
		Use horizontal section and click 
		Next. 
	 
 
- Select the 
		Part solid you want to recognize features from. 
	 
 
- Enter or select the 
		Slice location to specify the height at which you want to take a Z slice of the solid. 
		
Note: To use a Z slice at the edge of a solid, such as on the surface, you must enable the 
		  Use edge-based FR option in the AFR Options. 
		
 
	  
- Click 
		Preview to display a preview of the section in blue in the graphics window. 
	 
 
- Click 
		Next. 
	 
 
- Use the 
		Chaining page to chain the cross section into a curve and click 
		Next. 
	 
 
- Use the 
		Machining Side page to choose whether to machine inside or outside the curve. 
	 
 
- Use the 
		Location page to set the top and bottom Z heights of the feature. 
	 
 
- Complete the wizard to edit the feature, or click 
		Finish to use the default settings.