If you dont create another lookup field you cannot bind A a relationship with C. So there is no question to show data as a related list. Other wise you have to go for Visualforce (for Salesforce Classic) Lighnting Components (for Lighnting Experince).
You can create a Lookup relation in C with A object and define a condition into that lookup that only all related B's should be related to this A.
Thanks,
Prosenjit
There are multiple ways to achieve this:
As per your situation you can choose the best approach. For more details you can contact me directly on skype.
Thanks,
Gaurav
Skype: gaurav62990
If you dont create another lookup field you cannot bind A a relationship with C. So there is no question to show data as a related list. Other wise you have to go for Visualforce (for Salesforce Classic) Lighnting Components (for Lighnting Experince).
Thanks
Prosenjit