It's very easy to share publications with different kiosks. That way, you don't need to upload a publication more than one time and still have your publication appear in multiple kiosks.
Select the kiosk or multiple kiosks where you want the publication to show.
In order not to confuse between publications uploaded to a kiosk and shared publications, the shared publications do not show up in the kiosk list of the kiosk where the publication is shared to. Still, you can see the publications shared into a kiosk by selecting the kiosk and clicking the button "external publications". You will then see the list of publications available.