When several people do the purchasing, each one can own their suppliers. You assign them at Who buys what, linked at the top right of the supplier board. If nobody is assigned, nothing changes: everyone sees every supplier and none of the options below show.
Every supplier is listed, the ones you buy the most from first. Press Assign on a supplier, pick the person and save. To give many suppliers to the same person, tick them, pick the person in the bar at the top and press Assign. Press the cross on a name to remove it.
Some suppliers sell more than one kind of product, for example furniture and accessories, and a different person buys each. When you assign someone, choose onlya part of the range instead of the whole range. The parts come from the items' department, or from their category if there is no department, and show how many items each part has. One supplier can have several buyers, one per part.
Once anyone is assigned, the board opens on My suppliers: the headline, tabs and tickets then count only yours. Switch to All to see everything, or to No buyer to find the suppliers nobody owns yet. Each supplier shows its buyers next to its name.
If you own one part of a supplier, its order opens on that part only. The lines, the total, your saved draft and the order you submit cover only your part. Use the switch in the order header to see the Whole range or another part. See Reviewing a supplier order.