1. First, draw a cylinder. First, change the working range of cad. If you can remember the command, you can use it directly. Here, use the cylinder command in the figure.
2. Here, use this command to draw two cylinders, one large and one small, for operation.
3. Then use the move command to move the two cylinders to the bottom of the cylinder to coincide, and then use the subtraction command.
4. Then follow the prompts. First select the large cylinder around it, and then click the Spacebar on the keyboard.
5. Then select the small cylinder inside again, press the space bar, and you will find that the overlapping part between the large cylinder and the small cylinder has been removed.
6. Here, you can view from different angles, and all of them have been removed. This is how to use the subtraction command.