ADDSELECTED command is used to create a new object of the same type and general properties as a selected object, but with different geometric values.

After executing the command, we’re prompted to select object, which serves as the basis for a new object.

After selecting an object, we’re prompted to specify geometric values for the new object.

I have selected a circle, so in that case the geometric values would be center point for circle, the radius of circle.

The new circle has the same color and layer as the previously selected circle.

Use ADDSELECTED command can greatly improves your efficiency.