Allow projects to be added to more than one Hub

It would be good if we could link a project to more than one Hub. We have created a hub to place all projects that are under review (i.e. the engagement has closed and we are analysing the results). The Hub is an easy way for people and staff to view engagement that has taken place and know that it is still being considered. However, there are some projects that are linked to other hubs and I cannot link them to this new hub.