1. Select the Tangency element in the dialog box and click Define.

2. If you want the blend to be tangent to any surfaces at the first end, click Yes at the prompt. Each segment in the first section is highlighted sequentially. Select a surface for each highlighted entity.

3. If you do not want to specify tangency for the highlighted segment, click Done to move to the next segment.

4. Repeat the process for the other end of the blend.