If you ordered one product, like a CTO (configure-to-order) Mac computer, then there is only the total price of that configuration on the invoice. The change for each configuration steps was visible when placing the order, when selecting each tweaking, as the cost consequence of each change. But if the Store site is different now (different models, different prices), then you can’t see that information anymore.
There is no “official” breakdown in writing through invoices for this. You’ll have to make your own notes (or screenshots) when ordering. Your configuration specification with optional extra accessories (e.g. $20 cable or $70 AppleCare+) would have been send to you via email, though.
This is a user-to-user forum. You are not addressing Apple here. We have no access to invoice archives, nor the price breakdown for CTO for 7 months ago.