Creating password protected section

I have a retail site that I use woocommerce on wordpress for. I want to create a separate section of the website for wholesale ordering that people can access with a password, is there a way to do this so that people only have to enter a password once to enter the section but can access all the pages/products on that section and order through it. I want it to be a completely different section so that wholesale items and retail item will not be added to the same cart, etc….and you can only access with a password. Wondering if it would be easier to just buy another domain and do it through there?

Thanks for any help!