Hello Bruce, In this case, you would need to create a separate SKU for unlocking all 10 levels at the cost you are intending. This would be treated just as another sku for the onPurchaseResponse() callback.
Hello Bruce, The purchase confirmation and results screens that the In-App Purchasing API present are not controlled by you as a developer. These dialogs handled by the In-App Purchasing API and would not be able to handle more than 1 In-App Purchasing SKU at a time. So, unfortunately the specific use case you are attempting cannot be done.