First of all, a true Gadol is considered as such in part because of their humility and self-awareness of areas where they feel they have achieved true expertise, and likewise, those where others may have the requisite expertise in complex matter to paskin with confidence. While there is no “online directory” of which rabbonim are expert in every subject matter that might require consultation, invariably, your local rav/posek can provide guidance as to where you can find that expertise and also some logistical information on how to make contact (since most do not just have a cellphone number you can call or text and many don’t do email).
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