Zoho projects - Invoices

Zoho projects - Invoices

Hello,

I would like to know how I can bill the projects directly from Zoho Books. I currently have all the integrations enabled, but I am not capable. I can only bill from Zoho Projects.

I would also like to know if you can bill a project with a fixed cost from Zoho Projects, regardless of the number of hours.

Finally I would like to know if I can invoice a pack of hours in Zoho Projects and as the project progresses, the previously invoiced hours will be discounted.

Thank you,