How to: Prorate Freight, Insurance and Other Expense paid to different Suppliers for Assets

The Business Scenario is as below, PO is raised for Multiple Capital Assets to be purchased, it includes Freight, Insurance and custom charges for the complete consignment. We are also using LCM so payment for Freight, Insurance and custom charges are to be paid to separate Suppliers and Separate for the Asset itself. How can we prorate all the additional costs to multiple assets when it is to be Capitalized.