There's no practical limit to the number of items you can keep in your inventory. Each item in your inventory can also have an unlimited number of suppliers/vendors where each vendor can have different pricing structure but because it's a Parts-List manager it can also tell you what they're used for and manage the way one item affects another.

In the example above we're looking at an M10 Lock Nut and can see at a glance where they are and how many we've got. In the example, we've clicked the 'used in' tab to see which assemblies the Lock Nut is used in.

Of course it's a relational database system so if you modified something like the location, the description or the purchase price of our Lock Nut then it would have an instant knock-on effect throughout the database upating the parts lists and pick lists of every assembly where that nut is used.