Click the Offset tool
in the Create ribbon group.Mouse over your design to see the faces eligible for offset
relationships.
(Optional) Select options.Select the Find All Same Offset
option if you want to select all contiguous face pairs that have the same
offset distance as the pair you selected. If this option is not selected,
the offset relationship is only created for the selected pair of
faces.
Click the first face.
Click the second face.You have now established an offset relationship
between the face pair and other contiguous face pairs with the same offset
distance (if the All the Same option is selected). The Toggle Baseline tool
guide activates.
(Optional) Click to select the baseline face(s).When you move one of
the faces with a design tool, the other face in the offset pair moves to
maintain the offset relationship. When you fill one face of an offset pair,
the other face is also filled.