How to split payments for a single shipment under a Letter of Credit (L/C)

I am an L/C specialist. For a specific L/C transaction, I would like to arrange it so that the exporter (Beneficiary) receives 70% of the shipment value first after shipping, and the importer (Applicant) pays the remaining balance through the bank after completing cargo receipt and inspection. If this type of arrangement is possible, I would like to know what specific wording should be included in the L/C. Since the goods being traded are machinery equipment, we want to receive the balance payment only after installation and confirmation of normal operation at the importer's factory.