Click Fillet
on the Features toolbar.
In the PropertyManager, under Items
To Fillet, set Radius 
to 2.
Select the top face of the ring boss and the outside face of the base.
Add a fillet feature to round off the edges of the part.
Click Fillet
on the Features toolbar.
In the PropertyManager, under Items
To Fillet, set Radius to 2.
Select the top face of the ring boss and the outside face of the base.
Click 
.
