Allow item bundling as Magento does.
We sell certain products that require the customer to select other products to go with it. One example is a tennis racquet. We need to prompt our customer to select a string (from a sku in inventory), a grip (also a sku in inventory) and a few other things. This bundling technique would work great!

Magento bundles don’t currently work with Counterpoint, so this one is tricky. We know this would be a valuable feature for many merchants, so we’re looking at ways we might be able to make this work.
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Holly, JB's Tennis Shop commented
In the item customization, it allows for a dropdown of "items". Would be extremely helpful if these items could be existing inventory skus.