Linked/calculated Fields

Hello,

i have a Question about calculated/linked fields. I hope it's not to complicated.

So i use 3 Modules (e.g. A - B - C)

A got a relationship to B - so there is a field in A i choose a record from B. So its linked/in a relationship.

In C i have relationships to records in A. 

I want to display the linked field from B shown in C.

First i thought i just create a calculated field in C thats getting the information from the linked record in A. But it seems that the A - B relationship isn't possible to choose from.

Any ideas?