To finish, let's duplicate the current basic entity.
Select the entity then right-click
and select Duplicate
New name is automatically given based on the selected entity.
You can change it.
Press OK.
The new basic2 entity will be created on the map as a clone.
Now stop the simulation. Note that runtime entities (created during runtime) are automatically removed.
Populating the Scenario with entities can be done at Design or Runtime by just drag & dropping Entities from the Environment Tree List: