One Instant (Cloud PBX) several PBX system

Hey fellow Yeststar fans I have an Idea looking for input 

I would like to use (1) instant to hosted several small PBX systems here is my example 

Company A - Ext 200-205

Company B - Ext 210-215

Company C - Ext 220-225

I would like to do this to save the cost of always having to create a new instant Specially if the system only has between three and five extensions. Is there anyway to ensure that these customers cannot call each other or have access to each others system. Voice mail IVR ext 


I am thinking this is going to be to hard but worth the ask 


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