E.g. you could use the Extended Information / Text field (you don't need to create an Extended Info page to use this field) to display an additional set of tabs.
Just add the following to your product layout to enable this:
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<div class="product-text"><actinic:variable name="ExtendedInfoText" /></div>
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<div class="product-text">{Delivery}Delivery description here.{Returns}Returns info here.</div>