You can access this window through the menu Vehicles -> Suppliers.
 
This window allows you to create, edit and track your suppliers.
The list of your existing suppliers. Just click the one you want to select. A double click on a supplier will pop up the suppliers editing window.
Allow an easy and quick search by restricting the number of record to show. The generic character (*) is allowed.
To add new suppliers through the add/edit suppliers window.
Delete the selected record(s).
Edit the selected record.
Close this window.
Data about the selected supplier.