I think I akways have complicated questions, sorry!

2 questions:
1 - I kindly ask you to please tell me how can I search for a granted callsing ...
Explaining:
IOTA EU-120, I need to know which callsign is credited for EU-120. I have dozens of contacts on EU-120, but only one is credetid how do look for it? I tried different possibilities but I can't find any way to do it. This is very necessary in several cases, namely in case of errors, to replace one entity with another. This need does not apply only to IOTA, but to others.
2 - What field should I add in the "F7 Recent QSO" or "QSO Manager" view, to see the info, corresponding to the "SUB" in Awards tab / Add QSO?
Thank you for your attention and I hope to get some feedback from you.