Thank-you for your inquiry.
With this type of set up, Custom Capabilities are key.
You can think of Custom Capabilities as packages, or indiviual sets of content that you can set up without having multiple levels. These are not incremental, meaning that you can give your users as many Custom Capabilities as you’d like at level 1, and level 2 members will not have access to these Custom Capabilities unless you specify that they should when they sign up.
See: Dashboard -› s2Member® -› API / Scripting -› Custom Capabilities
What you’ll need to do here is set up a Custom Capability for each of of the groups of Level 1 content. For instance, you might have 4 custom capabilities like the following:
group_1
group_2
group_3
group_4
You can then protect your content with Custom Capabilities just the same as Membership Levels, and sell access to these capabilities regardless of levels. This means that if you’d like, you could upsell users extra Custom Capabilities to allow them to access more content.
See: Dashboard -› s2Member® -› PayPal® Pro Forms -› Shortcode Attributes (Explained)
See Also: Knowledge Base » A Basic Guide to Protecting Content With s2Member®
Let us know if you have any further questions/concerns. :-)