In ordered modeling:

When you construct variable-radius blends in Solid Edge, you can define different radius values at keypoints and intersection points along an edge or face.

In synchronous modeling:

With the Blend command, you construct variable-radius blends in Solid Edge by defining different radius values at keypoints and intersection points along an edge or face.

The next illustration shows a round with different radius values at the two endpoints and midpoint of an edge.

You can use a radius value of zero when creating variable radius blends. The round below has a radius of 15 mm at one end and zero at the other.