When using the native Revit ‘Create Similar’ it is not possible to select multiple elements. With the Daikin ‘Create Similar’ this becomes possible. 

As a modeller you select the elements, in the next step you select a location for placement. This location will be the center of the selected elements. This tool reduces the design time to draw similar groups of objects at different rooms, walls, ceilings,…

You can find this command at the default Daikin tab and in the Contextual ribbon of Daikin (see article about contextual Ribbon)  and has following icon.



Below you can find an example of the Daikin 'Create Similar' tool where multiple elements are selected