In Ontario, when one joins either the Federal NDP or the Provincial NDP, one is automatically a member of the other. For some time now in Ontario, the provincial government has decided that in southern Ontario, the boundaries for provincial ridings will be the same as the boundaries for federal riding. One result is that, for the NDP, Federal and Provincial Riding Associations can operate either separately as two distinct entities or jointly. The same person can be the President at either level, similarly with the Financial Officer. This is a local decision.
Each Riding at both levels is legally required to have a President and a Financial Officer. These people must be two separate individuals but each one can serve at both federal and provincial levels.
In Hastings, Lennox and Addington, we currently operate with a loosely formed joint executive. When issues specific to either provincial or federal matters arise, those issues are voted on separately - for example, accountability to the respective Electoral Commissions or local financial matters or selection of election candidates. Otherwise more general matters are discussed as a whole.