V803.409c - Vantage (Progress) >> Security for Supplier Tracker

We have several people creating PO's and are looking to add our Maintenace dept. into the mix; my question is this how can I stop "unwanted" searches into the full Suppliers tracker where we have information/invoices/payment?

We reimburse employees and executives through AP and these people are set up as suppliers - how can I stop "unwanted" personnel from getting into my whole supplier search?