Does Export Filing: CHIEF/CDS also support several special procedures which are used in the UK like PSA for supplementary declarations, C21, EXS, and others? Ruth Setzler November 30, 2020 12:58 Updated Export Filing: CHIEF/CDS has your back with all major special export procedures – just leave the details to us. Related articles Applying AEB standard templates (easy mode) How does Export Filing: CHIEF/CDS work with the HMRC systems? How quickly can I get started with my first UK export declaration? (easy mode) What happens if the customs requirements change? (easy mode) Comments 0 comments Article is closed for comments.