Yes, you can easily modify/amend the product quantities in the school/child packs by logging in to the Parent Portal. You can amend/modify the quantity of each item for kindergarten/prep, Year 1, Year 2, Year 3-4, Year 5-6, and Year 7-8. Remember that you can only modify the quantity but you can't remove the mandatory items.
For more information or if you have any queries, please contact COS customer service on 1300 792 785 or via email on parentportal@cos.net.au.