My name is Ciarán, I'm a Shopify Support Guru.
So there are two ways to to do this generally, you can have an entirely different website for wholesale and trade or you can implement a few apps to help you achieve this:
-There are other options available in our App Store so have a look and see what works for you and your business.
Do one of these work for you? Let me know
All the best,
Ciarán H | Shopify Guru