Parameter exists? type

Hi,
I have this case:
I have a nested test inside a main test. I want repeat this nested test if in .csv, the params(differents) inside have information.

exemple:
//Main test–inside have–subtest X, that type a parameter and save.
//.csv–inside has parameters A, B and C with different information.
if param A in csv has information, in subtest X type.
if param B in csv has information, in subtest X type.
if param C in csv hasn’t information, don’t type and continue with the next step inside main test.