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You can use the Allocate button in the lower table to allocate each group's amounts (from the CIF (AED), Total Duty, and Service Charge columns) within the group proportionally to item amounts in the Invoice Amount column (of the lower table).Then
The amounts in the VAT Amount (AED) column, the VAT amounts for each item/group are calculated based on the sum of the amounts from the following columns: CIF (AED) , Total Duty , and, if the Include the Service Charge into Import Value (for VAT calculation) check box is selected, Service Charge column (lower table) are also the results of allocation of the VAT amounts of corresponding groups.