Is it possible to set up Bold Custom Pricing: Wholesale to give customers with a specific tag, such as #member, a 10% discount on all products?
Yes, Bold Custom Pricing is able to create a discount for customers with a specific tag. More details on creating tags within Custom Pricing can be found here - https://support.boldcommerce.com/hc/en-us/articles/360044720711-Create-Edit-or-Delete-Customer-Tags.