Customized Reports of Quotation, Invoice, Sales Order

How could I design customized reports of quotation, sales orders, invoices?

https://erpnext.org/docs/user/manual/en/setting-up/print/print-format-builder

https://erpnext.org/docs/user/manual/en/customize-erpnext/print-format

How could i have the list of variable if i develop in Print Format (Custom Format)? I need as per following:

If any field is not in the standard form, you can create custom field.

https://erpnext.org/docs/user/manual/en/customize-erpnext/custom-field

The form fields will be available for use in print formats like any other field.

I developed customs field and linked with Employees but I’m unable to fetch the data. Could you guide more like if I select an employees then I need to print that employee cell number and email on quotation and how could I fetch that data? Our objectivity is select and print any concerned employee details for contact on quotation.

Any advice

Hello Rachna please make a new post regarding your issue.