@Admin Communities I am looking out to share Partner owned Opportunities with non-Managers inside my Org. Is it possible for an Internal User who is not a Manager for the Partner to view and edit opportunities?

I understand there is always sharing Rules because Partner users have a different line of Role Hierarchy and only roll up to a single Account Manager. 

I am looking out for options like default Teams and Sharing sets in community Settings. More granular sharing of data depending on partner region.

Thanks