Is it possible to create custom field in Zoho Books with data type as lookup? I have not seen the option in the dropdown.

If not is there a way around to include some item in my Invoice as my part of my custom field?

To elaborate-

I wish to create a custom field with type as Auto Generate Number where prefix shall be customer name and auto generating number shall start from 1. So I would come to know number of invoices generated for each customer.

My another query is related to newly introduced feature of Custom Buttons in Invoice module.

Is it possible to clone the invoice with Invoice date being modified as today's date?

Would really appreciate your guidance.

Thanks