The vendors list is accessible from the consumables collection index page > settings menu > Manage vendors
The manufacturers/vendors from this list will be suggested when adding new items to any of the collections under the manufacturer field.
It is possible to edit each vendor to update the contact information. In addition using the checkbox Distributor / Representative is possible to mark a company as such.
Using the drop down menu it is possible to choose if the current company is Represented by another vendor from the list