Adding an extruded flange to a solid using the chain option

To accomplish this task, open file "ExtFlan01.e3". After starting the Extruded Flange command, proceed as follows.
 

1	Select the profile that will be used to define the direction of the flange. About the profile The profile to be selected must: Be open Contain only lines and arcs Have one of its endpoints on an edge of the solid. To change the selected profile, right-click on Profile, choose Reset in the context menu and select another profile.
2	For the Type option, select Chain.
3	Select the edge on which you want to create the flange. To change the selected edges, right-click on Edges, choose Reset in the context menu and perform selection again.
4	To define the length of the flange, in the Extension drop-down list under More Options select 1st Distance and 2nd Distance. The 1st Distance and 2nd Distance mini-dialog boxes are displayed on the model. Enter 20 for 1st Distance and 30 for 2nd Distance.
5	Click or to confirm your selections and create the flange. Click to discard your changes.