There are a couple ways to duplicate a shape multiple times in Illustrator. The first way is to use the Edit > Copy command.
PRO TIP: If you are looking to duplicate a shape multiple times in Illustrator, be aware that there is no one-click solution. You will need to use the Transform tool (E) and adjust the settings accordingly. With the Transform tool active, click on the shape you want to duplicate and drag it to the desired location. A dialog box will appear with various settings – make sure “Copy” is checked, then click “OK”.
The second way is to use the Edit > Duplicate command. Both of these methods will create a copy of the current shape that you can edit as needed.
The Edit > Copy command will create a copy of the current shape that is identical to the original. The Edit > Duplicate command will create a copy of the current shape that is identical to the current selection.