Hi @steveklt,
Thanks for contacting us!
Our fields are custom meta and the WooCommerce Wholesale Prices saves the wholesale price data in wp_postmeta with this meta key: {wholesale role}_wholesale_price
So when the wholesale role key is wholesale_customer, the meta key should be something like wholesale_customer_wholesale_price.
I suggest setting up one or two products first with a wholesale price so that when you export, you’ll get all the correct field column meta fields and then reimport with all your products.
After importing the products, we recommend pressing the Re-Initialize Product Visibility Meta as WPAllImport doesn’t trigger the save_post action during the import so this data would need to be rebuilt to ensure the product visibility settings are respected properly. Please be aware that this feature is exclusive for WooCommerce Wholesale Prices Premium and you can find this setting on WooCommerce > Settings > Wholesale Prices > Help.
For additional reference, please click here:
https://wholesalesuiteplugin.com/kb/how-to-fix-broken-product-visibility-after-product-importing/
I hope this helps. If you have any other questions, feel free to ask me again.