Submitting diamond cutters with multiple certificates to the customs declaration unit for filing is a complex process that requires a thorough understanding of the relevant regulations and procedures. The first step is to ensure that all the necessary documents are in order. This includes the diamond cutter's certificate of origin, the diamond cutter's certificate of authenticity, and any other relevant documents. Once all the documents are in order, the diamond cutter must be submitted to the customs declaration unit for filing. The customs declaration unit will then review the documents and determine whether the diamond cutter is eligible for importation. If the diamond cutter is approved, the customs declaration unit will issue a customs declaration form, which must be completed and submitted along with the diamond cutter. The customs declaration form must include the diamond cutter's description, value, and any other relevant information. Once the form is submitted, the diamond cutter will be cleared for importation.