You can create a solid cylinder with a circular or an elliptical base.
You can use the Axis Endpoint option of the CYLINDER command to determine the height and orientation of the cone. The axis endpoint is the center point of the top plane of the cylinder. The axis endpoint can be located anywhere in 3D space.
With the 3P (Three Points) option of the CYLINDER command, you can define the base of the cylinder by specifying three points anywhere in 3D space.
If you want to construct a cylindrical form with special detail, such as grooves along its sides, create a 2D profile of its base with a closed PLINE and use EXTRUDE to define its height along the Z axis. This method, however, creates an extruded solid, not a true solid cylinder primitive.