_bundle_price, it should be used instead of the line item price.
_original_bundle_pricethat overrides an "original" (compare at) price.
_bundle_priceproperty set. If that's true, then
/apps/bundles/cartshould be used as an "action" for the cart checkout form.
bundlebuilder-cart-item.liquidsnippets on any theme that has Bundle Builder installed for example of implementation.