This is the 3066th most frequent Chinese word.
辦理
To handle or process.
辦理 is used here to mean 'to handle' or 'to process' an official procedure or task, specifically visa formalities in this case.
我需要辦理簽證手續。
I need to process the visa application.
辦理 in this sentence represents taking care of the necessary formalities and paperwork involved in obtaining permits.
他正在為公司的新項目辦理相關許可證。
He is handling the relevant permits for the company's new project.
Here, 辦理 refers to managing the procedural aspects of mailing a package at the post office.