Can a Customer be given access to a subform within Reports via the Client Portal?

Can a Customer be given access to a subform within Reports via the Client Portal?

I am trying to find a way to allow a group of customers to access summary data (Reports) within the CRM that are specific to them. I wondered if it was possible for Customers to be given access to a subfolder within the Reports module of CRM or if that was something that was in development? Or do you have another way that I might achieve something similar on a customer basis? Is the Attachments subform accessible for the customer? Or is there another vehicle that would allow me to save/export reports and then attach them within CRM and then they would be accessible to a customer?