The Supplier Info screen allows you to track much information on each Supplier.  Multiple contact numbers, Contact log notes, Alerts, and Repeating Alerts are all supported.  A few years ago, a few suppliers would account for all or most of your needed supplies. But today it is common to have 50 or even 100 different suppliers as more and more markets specialize. PestaRoo allows you to have any number, and fully track each of them.