On reading the information you have now supplied, I think your first step should be to share the roles of chair, secretary and treasurer between the two of you – you can do that at a properly constituted committee meeting with “election of officers” on the agenda.
That is the first step to a proper dog and tail relationship being established.
FYI: Anyone on the committee can hold two or three offices jointly, the committee can elect (or sack, for that matter) any officer at a properly convened meeting, and the committee can resume the roles delegated to the strata manager at any time they so choose.