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Before

After

1. Create a cylinder.
   
   On the [Model] tab, go to and click ▼ at the bottom of [Solid] .
   Click [Cylinder] on the submenu.
    

2. Designate the center.
   
   Click the center point on the modeling window.
    

3. On the [Snap] context tab
   
   ,
   
   activate [Center Snap] , and click and select the inner circle. The coordinates of the center of the circle will be picked up.
   
   Snap is explained here

3. Enter Radius: 10 and click .
    

4. In the parameter input dialog box, enter Height: 1 and click .
    

5. Click in the parameter input dialog box and exit.
   
   The cylinder is now ready.
    

6. On the [Model] tab, go to
   
   
   
   and click [Subtract (Boolean)] .
   
   The [Subtract (Boolean)] dialog box will appear.

7. Highlight the cylinder created at 5 and click to select. Also highlight the truncated cone created at the session 17 and click to select.

8. Click in the [Subtract (Boolean)] dialog box to exit.
   
    

9. Deselect [Keep Target Bodies] and [Keep Subtracting Bodies].

The center button is now ready.