Log what the crew posts.Read the WhatsApp group and enter each take in the app, so the on-hand count stays accurate.
Check what's on hand.The Inventory tab — any trade, any time. See what's low before the crew runs out.
Order what they ask for.When someone requests something in the group, place the order and mark it handled.
Super vs. owner: the superintendent (David) sees and runs the whole site. Only owners (Milan & Kamal) change the master lists — the material catalog, people, and PINs.