In the Accounting module under Supplier Invoices and Customer Invoices, it is possible to get Unpaid Bills by performing a search. Can this same task be achieved through Odoo reporting?
what are the other possible report categories we can add to dash board ( i.e. Profit and loss , Balance Sheet etc. ) and how?
All the filtered views can be added to the dashboard as in the above example. But, I am not sure about printable reports such as P&L and Balance Sheet. Sorry about that. Only way I can think of is that doing it through menu items and views in technical settings (Settings -> Technical) or by developing a new custom module. But I have not tried those alternatives yet.