Unfortunately, the county parties do not list the committees despite the information being public, but this is a link to the county election results page.

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Regardless of party you should have at a few state committee members who will vote to endorse on your behalf, so I think it's fair game to respectfully contact a member by email detailing your preference.

https://results.enr.clarityelections.com/PA/Allegheny/112982/web.285569/#/summary?category=C_3

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I can tell you that the state committee almost voting to endorse Conor Lamb was incongruent with the desire of the voters.