1. Open solidworks20 106 software, click the new part, and click the drawing boss/matrix inside the feature.

2. Select the stretched datum plane as the upward datum plane.

3. Draw a circle of 70x40mm on the datum plane, and the effect is as follows:

4. Then enter the boss stretching setting. You can set the direction and stretch upward. Set direction 2 to pull down.

5. That's it.