客户担心清关出问题,我想问问,请帮译成英文,多谢

The customer is concerned about issues with customs clearance. Can you please advise me on what is required for the customs clearance process? For example, what is the most advantageous declared amount? What is the most advantageous product name? I have two boxes of goods. Can I send one box first and send the second box after the first box has passed customs clearance? I would appreciate your feedback on this matter.