You are not allowed to post the same resource more than once - our Content Guidelines provide further information on duplicate listings.
If the resources are substantially different, you can post these as separate resources but should clearly outline the similarities and differences between the products in the description.
If your resource is aimed at more than one Level or Age Group, you can select these under the Product Attributes when you set up the product.  For more information, please refer to our Guide to setting up a product.