Bangladesh Trade Portal (BTP), an official source of all regulatory data relevant to traders who are looking to import goods into Bangladesh and export to other countries, is available. To increase the predictability of and transparency of Bangladesh's trading laws, and processes, the Ministry of Commerce of Bangladesh Government created the Portal. Bangladesh Portal
The Portal provides information on import and export to Bangladesh. Click on the relevant links to view the Tariffs for each commodity. You can also find any special measures and the procedures to apply for permits, licenses or Customs clearance. The Guide to Trade, found at the top of this webpage, contains a comprehensive set if instructions and guidelines that are written in plain English and organized by topic. The Trade Portal reflects the government's commitment towards information sharing. This 7th Five Year Plan focuses on economic growth and compliance to Article 1 of the Trade Facilitation Agreement.
These links will provide you with information on the process of import-export transit, as well as the regulations that apply to the process.