I have multiple sites running off the one umbraco instance, and I would like to have the masterpage templates for each project in its own subfolder, e.g. /masterpages/projectA, /masterpages/projectB, etc.  I have created the masterpage files like this in VS, but they're not being picked up in umbraco.  Is it possible to do this? If so, how do I go about doing it?

Thanks