Custom Post Type and Structure Question

This is a tough question to get an exact or correct answer to because it’s subjective… for example, I’d not use ACF, but someone else would.

Here’s my suggestion for how to streamline this, if I’m understanding it correctly…

Keep the Custom Post Type for ‘Items’ – then, I guess, keep using ACF to build the fields into the CPTs.

For the different displays you’re using different templates. So one for single items, one for individual auctions, etc.

Then, make the auctions a taxonomy – you can also add custom term meta (as of WP 4.4) to taxonomies and custom taxonomies. (Previous method was to make the meta data wp_options and then associate the options with the taxonomies.)

Then you’re just assigning ‘Auctions’ to the ‘Items’ and you can then build templates that dynamically load all of the items in an Auction.

From there you can apply ACF’s date fields to different areas, etc.