Right-click actors in the Viewport panel and select Edit > Copy and Edit >Paste to create duplicate actors with the same properties as that of the copied actor. You can paste the same actor multiple times.

You can also use the standard short cut keys Ctrl+ C and Ctrl + V to copy and paste actors.

When you copy an actor, the duplicate actor is pasted on top of the original one. Simply drag the new actor to place it in a new position in the Viewport panel.

You can edit duplicate actors independently; any new modifications on the original actor have no effect on its duplicates.