Create types of equipment
Instead of locking you into a specific definition of parts you can define all of the general part categories, like printers, then you can specify whatever items you want to track for that item to make it unique.

Create models of equipment
Once you have creates a part type, you can further define parts by creating a specific instance of a part, like a 20 gig hard disk.

Define specific parts
Once you have defined a category and model, you can add a specific part you to your inventory and track it from there, transfer it to a client inventory, or sell it.