Your situation seems to belong to the second situation. So it's no problem for you to convert RMB into 1000 USD. The problem is the explanation and proof of your foreign exchange use. In addition to traveling, you must also provide the bank with credible proof of foreign exchange payment, otherwise you need to go to the safe to handle foreign exchange.
3. Remittance is to exchange RMB for US dollars (if you travel, the bank will give you US dollars in cash).
If you have a foreign exchange certificate and it is less than 50,000 yuan, you can wire transfer to your designated overseas (including Hong Kong) commercial bank account through any commercial bank.
At present, credit card processing is relatively simple, and some banks do not need proof of income.
Paying foreign exchange by credit card is also an option, but you need to apply for a foreign exchange credit card (USD credit card). Then, you take your credit card (or pay online or by telephone) to pay the relevant foreign exchange payments abroad, and then pay the corresponding RMB to the bank after you come back (the bank is interest-free within 45 days).