I only want to allow certain customers to have access to bulk discounts, how can I do this?

You can restrict what types of customers have access to bulk discounts using a setting in your account.

Select 'settings' from the left menu and then 'b2b'.

Find the section labelled 'who should have access to bulk discounts'.

Here you select who SHOULD get access to bulk discounts.

Regular visitors - this can be any visitor that isn't logged into an account
Registered customers - these are customers logged into a normal customer account
Trade customers - these are customers logged into a trade account

Once you've selected who should have access to the discounts save your changes.