Hope it will be helpful and you can understand. I remeber that the staff told me that what they need is the dang3an4 suo3zai4chu4 gai4de zhang1,not the unit's zhang1 when i applied the passport. I'll say,you can resign from your unit, and put the file in the ren2cai2guan3li3zhong1xin1 and let them gai4zhang4 on the passport application form.but What you need to do is before you resign,you'd better get the related certifications of the salary or vacation with zhang1 on them.