I see.
Have a look at note http://service.sap.com/sap/support/notes/1681092
If you are talking about a production system, then you cannot have more than one HANA database on one HANA appliance.
So, if your current setup means that your multiple HANA Applications currently all have their own database, then you will not be able to run them on one production HANA Appliance.
You could of course look at virtualising the HANA Appliance. This is supported by SAP and would allow you to have one physical HANA Appliance, split into multiple virtual HANA Appliances.
It's very niche and you'd be uber cool for doing it. 