After placing rebar in a host, you can modify rebar properties to assign hooks. 
  
Rebar hooks have a matrix relationship between the hook angle and rebar size. The rebar hook type comprises a defined hook angle and initial hook length. If the existing hooks are appropriate, you can start this procedure at step 7. 
	 
- In the Project Browser, navigate to Families Structural Rebar Structural Rebar Rebar Hook. Rebar Hook.
- Right-click a hook, and select Duplicate. 
		  
- Double-click the new copy. 
		  
- Define the Style, Hook Angle, and Extension Multiplier in the Rebar hook Lengths dialog. 
		  
- Click OK. 
		  
- Right-click the new hook type, and select Rename. Enter a name for the hook type. 
		   You can now apply this hook type to instances within the project to ensure accurate scheduling. 
		  
- Select either a rebar instance or a rebar set. This will require a section view or unobscured rebar visibility settings. 
		  
- On the Properties palette, add hooks as needed under the Construction section: 
		    
			 - Select a hook type from the Hook at Start parameter. 
				
- Select a hook type from the Hook at End parameter.