Import Category Codes into Purchasing

 Hi,
I want to load NIGP commodity codes into Purchasing. We do not have inventory set up. Just wanted to populate ITEM CATEGORY VALUE SET, COMMODITY VALUE SET dependent on ITEM CATEGORY VALUE SET , CATEGORY CODES to include category codes for each category and commodity combinations and CATEGORY SET to include each item category and commodity.

I would like to load the codes from the excel sheet into this system to achieve the above fucntionality. How can I acheive this.

Thanks,
Vijaya