To Place a Fillet Between Two Surfaces

Select the Fillet Surfaces tool ( Modeling > Surfaces > Modify Surfaces > Fillet > Surfaces ).
From the Truncate option menu, choose a truncating option.
In the Radius field, type the required radius.
Identify the first surface.
The arrow handle displays the side on which the fillet will be added.
Identify the second surface.
The arrow handle displays the side on which the fillet will be added.
Click the Data button to accept.