Some useful links for import and export procedures:
CEPT Scheme
http://www.mof.gov.bn/English/RCE/CustomsMatters/CustomsProcedures/CEPTScheme/Pages/default.aspx
Customs Import Duty
http://www.mof.gov.bn/English/RCE/CustomsMatters/CustomsProcedures/CustomTaxes/Pages/default.aspx
Customs Valuation
http://www.mof.gov.bn/English/RCE/CustomsMatters/CustomsProcedures/CustomValuation/Pages/default.aspx
Examination of Goods
http://www.mof.gov.bn/English/RCE/CustomsMatters/CustomsProcedures/ExaminationGoods/Pages/default.aspx
Import and Export License / Permit
http://www.mof.gov.bn/English/RCE/CustomsMatters/CustomsProcedures/Permit/Pages/default.aspx
Import and Export Procedures
http://www.mof.gov.bn/English/RCE/CustomsMatters/CustomsProcedures/ImportExport/Pages/default.aspx
Prohibition and Restriction
http://www.mof.gov.bn/English/RCE/CustomsMatters/CustomsProcedures/ProhibitionRestriction/Pages/default.aspx
Brunei Public Holidays
http://www.information.gov.bn/pressroom/index.php?option=com_content&view=article&id=1633&Itemid=86