Merging Software box smart objects? How do I add more boxes to my smart object?

[Allenpd1]

Hey guys

I have a software box template PSD with 2 software boxes.  I was wondering what is the quickest way to add a further 2 boxes, 4 in total to the template which I can edit.  I have 4 products with different designs. Thanks

[c.pfaffenbichler]

Could you please post a screenshot with the pertinent Panels (Toolbar, Layers, Channels, Options Bar, …) visible? 

Is this about being able to edit the new items independently? 

If so New Smart Object Via Copy might be an option or, if there are multipple instances, duplicating the whole image and dragging the elements back to the original.