how can I modify the default Invoice and Quotation No to a Custom Invoice and Quotation No? my custom ref# are similar to this: yr(from the date) - doctype(invoice: 03, Qouation: 02 -customer_id - letter(for cat) serial-No 23 -02- 003 -G 250 result: 23-02-003-G250

attached sample

the year is extracted from the doc date automatically

Also, I like to remove some fields for Invoice and Quotation we never use, for simplicity.

thank you