You can set up product catalogs with items that only present to certain groups of customers based on their customer group assignments. If you sell multiple lines of products, with different customer bases for each, you can assign each customer to a group that shows only products that are relevant to them.
If you have products designed specifically for certain customers or buyers, or have special edition items that only go to a certain group of accounts, Catalog Restrictions will let you hide those products from those who aren’t eligible to buy them.