More than one / multiple products support?

My company sells website hosting, logo design and other services.
We have subscriptions and S2 Pro seems to work great for that. We also need to be able to have "add-on" purchase products in addition our monthly subscriptions.
Is there anyway to have S2 support a new subscription and allows the purchase of additional products before checking out / paying?
We have subscriptions and S2 Pro seems to work great for that. We also need to be able to have "add-on" purchase products in addition our monthly subscriptions.
Is there anyway to have S2 support a new subscription and allows the purchase of additional products before checking out / paying?