Once you have created your event, the event homepage will now show a 'manage suppliers' button.
On your event homepage, click the 'manage suppliers' button. You will be asked to add in the the suppliers name, email, TRACE modules you are requesting data for and the due date.
Once you have added your supplier, you can send friendly reminders to request their data and leave notes for other colleagues on the suppliers.
You will most likely still need to send through supplier guides to help your supplier understand what is needed.