Multiple entities relationship with shop customers vehicle

How can I connect multiple identities with no common sharing fields between them into one object? Also what would be the relationship between these identities? Do I need to add a field called ID for each like CUSTID or ShopID or whatever to my struct that I built?

Also I want to put them all in separate array obj for example customer struct with its properties will be stored in customer = [Customer] ()

How do I store and access them from a custom cell with label and textfield in a tableviewcontroller so that they all attach together as one object with shop and with techninfo shopinfo and with inspectionitems.

I am a new programmer trying to do my project on my own and my concept need some clarification so I can move forward with it and get this app done. Please help if you can ...any help will be appreciated.

Multiple entities relationship with shop customers vehicle
 
 
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