Multi Row Inventory GUI:

Unity Engine
1 
[System.Serializable]
public class PlayerData {
public List<Item> inventory;
public float maxWeight = 200;
        public float currentWeight;
    }
    public PlayerData playerData;
void InvGui () {
        GUI.Label(new Rect(375, 50, 500, 50), "Weight: " + playerData.currentWeight.ToString() + "/" + playerData.maxWeight.ToString());
        if(GUI.Button (new Rect(100, 100, 55, 55), "Helm: ")){

        }
        for (int i = 0; i < playerData.inventory.Count; i++) {
            GUI.Label(new Rect(375, i * 55 + 100, 200, 55), playerData.inventory[i].ItemName + " x" + playerData.inventory[i].Quantity.ToString() + ", Weight: " + playerData.inventory[i].totalWeight.ToString());
            if (GUI.Button (new Rect (300, i * 55 + 100, 55, 55), playerData.inventory [i].ItemIcon)) {
                playerData.inventory.RemoveAt (i);
            }
        }
    }

The problem with this script is it only gives a single line for the inventory GUI icons. how to make this multi row?

2

For multiline, you use a nested loop. Try googling, c# nested loop table.