Use this procedure to apply modifiers to the model. The procedure below uses the example of applying a transition modifier to the two rectangular shaped parts described in Adding a Constraint. For more information on modifiers, see Modifiers in Understanding Part Builder. 
- In the part browser, right-click Modifiers and click Add Transition. 
 
- In the modeling area, select the top face rectangular profile for the start profile; then select the bottom face rectangular profile for the end profile. 
A transitional box is created to represent the diffuser, and a transition modifier is added to Modifiers in the part browser. 
  
- To add the lip of the diffuser, in the part browser, right-click Work Planes and click Add Work Plane. 
The Create Work Plane dialog box is displayed. 
  
- Click Offset, enter Lip Offset for Name, and click OK. 
 
- In the modeling area, select the XY plane as the reference work plane, drag the cursor above the XY plane, and enter 1 for the offset distance. 
The Lip Offset work plane is created. 
  
- In the part browser, expand Modifiers, right-click Transition, and click Visible. 
 The transition modifier display is turned off in the modeling area. 
  
- In the part browser, right-click Modifiers, click Add Extrusion, and select the top face rectangular profile. 
The Extrusion Modifier dialog box is displayed. 
  
- Under Termination, select Plane for Type, select Lip Offset for To, and then click OK. 
A box is created to represent the top lip of the diffuser, and an extrusion modifier is added to Modifiers in the part browser. 
  
- To see the entire model of the part, in the part browser, right-click Transition and click Visible.