I do not know whether this is allowed or not at ERPNEXT.
Let say I want to create or duplicate new PURCHASE INVOICE form, and give several editing at field, then save to NEW FORM with new name PURCHASE INVOICE SPECIAL. When saving this form, it will save at same existing doctype or mysql table.
Please tell me how to do that if ERPNEXT have this options, or maybe if I have to edit some python script, please let me know where to start.
Thank you in advance 