Required Inputs   

• Profile
  Select the first profile for the rib feature.  If you plan to use multiple profiles, enter the thickness (see below) for this profile.  You can continue selecting profiles (and entering thicknesses).  Middle-click when you’re done.
  
  
• Thickness
  This input is used to thicken one-dimensional profiles.  Each profile should represent a set of ribs that do not self-intersect.  Use this input to specify the rib thickness for the selected profile.  Thickness is used to "flesh out" simple a line work into loops as in an extrude.  If the profile or sketch is already a closed loop as desired, thickness can be 0.  Each sketch or profile can have  a different thickness.
  
  
• Boundary
  Select all boundary faces where the ribs will intersect the part.

Optional Inputs   

• Draft angle
  Specify the draft angle for the side of the rib walls.  Pay attention to the preview echo on the display.  It will show you which way the draft will go depending on the +/- value of this draft angle input.

Advanced Options    

• Add Offset
  If you do not have the complete width of the rib network defined in your profile, you can use offset attributes.  First specify the profile to offset and then enter the offset value.
  
  
• Delete Offset
  Use this option to delete an existing offset attribute.