You can keep contact information on different vendors that you may purchase supplies from in this section.

When adding new parts to your inventory you can add in the vendor that you purchased them from.  This is not compulsory but if you wish to do so it is best to add in any and all of your preferred vendor details before moving on to Step 5 – Inventory Parts.

To add a new vendor simply select "New" on the right hand toolbar and fill in their details on the Vendors screen that comes up.