You can edit:
Note: If your changes result in a geometric impossibility, or cause problems in subsequent features, you will be warned by the Conflict Solver.
Editing the Taper by the Feature Guide
Right-click on the Taper name in the Feature Tree. In the popup menu that appears, select Edit Feature.
The Feature Guide will appear, automatically open to Required Step 3. You now return to the same situation in which you created the Taper.
Make modifications in the current step, and / or click the icon for
other steps you want to modify. Press OK
or Apply 
in the Feature Guide to complete the function.
Editing the Taper Angle Value Only
If you want to modify only the Taper angle, double-click the Taper name in the Feature Tree.
The Taper angle is displayed. Press exit to leave edit mode, or click the value to open the Dimension Dialog. In this dialog you can enter another value.
When the parameter is updated, click 
to update
the feature, or you can update it later. (If you do not update now, all
updates will be done automatically the next time you create or edit any
feature or object.) Exit to
leave edit mode.
See also: