How can i add an scene item to the inventory?

Hey, im trying to add an pickUP script to add the scene item to the inventory but i dont know how.

Here is my Inventory System

public class Inventory : MonoBehaviour 
{
	public int slotsX, slotsY;
	public GUISkin skin;
	public List<Item> inventory = new List<Item> ();
	public List<Item> slots = new List<Item> ();
	private bool showInventory;
	private ItemDatabase database;
	private bool showTooltip;
	private string tooltip;

	private bool draggingItem;
	private Item draggedItem;
	private int prevIndex;

	void Start()
	{
		for (int i = 0; i < (slotsX * slotsY); i++)
		{
			slots.Add (new Item());
			inventory.Add (new Item ());
		}
		database = GameObject.FindGameObjectWithTag ("Item Database").GetComponent<ItemDatabase> ();
		AddItem (0);
		AddItem (1);


	}
	void Update()
	{
		if(showInventory == true)
		{
			Time.timeScale = 0;
			GameObject.Find ("FPSController").GetComponent<FirstPersonController>().enabled = false;
		}
		if(showInventory == false)
		{
			Time.timeScale = 1;
			GameObject.Find ("FPSController").GetComponent<FirstPersonController>().enabled = true;
		}
		if (Input.GetButtonDown("Inventory"))
			{
				showInventory = !showInventory;
			}
	}

	void OnGUI()
	{	
		tooltip = "";
		GUI.skin = skin;
		if(showInventory)
		{
			DrawInventory ();
			if (showTooltip) 
				GUI.Box (new Rect(Event.current.mousePosition.x + 15f, Event.current.mousePosition.y, 200,100), tooltip);
		}
		if(draggingItem)
		{
			GUI.DrawTexture (new Rect(Event.current.mousePosition.x, Event.current.mousePosition.y, 50,50), draggedItem.itemIcon);
		}
	}
			
    void DrawInventory()
	{
		Event e = Event.current;
		int i = 0;
		for (int y = 0; y < slotsY; y++)	
		{
			for (int x = 0; x < slotsX; x++)
			{
				Rect slotRect = new Rect (x * 60, y * 60, 50, 50);
				GUI.Box (slotRect , "", skin.GetStyle("Slot"));
				slots  _= inventory *;*_

_ if (slots .itemName != null)
* {
GUI.DrawTexture (slotRect, slots .itemIcon);
if (slotRect.Contains (e.mousePosition))
{
tooltip = CreateTooltip (slots );
showTooltip = true;
if (e.button == 0 && e.type == EventType.mouseDrag && !draggingItem)
{
draggingItem = true;
prevIndex = i;
draggedItem = slots ;
inventory = new Item ();
}
if (e.type == EventType.mouseUp && draggingItem)
{
inventory [prevIndex] = inventory ;
inventory = draggedItem;
draggingItem = false;
draggedItem = null;
}
}
} else if (slotRect.Contains (e.mousePosition))
{
if(e.type == EventType.mouseUp && draggingItem)
{
inventory = draggedItem;
draggingItem = false;
draggedItem = null;
}
}
if (tooltip == “”)
{
showTooltip = false;
}
i++;
}
}
}
string CreateTooltip(Item item)
{
tooltip = “<color=#ffffff>” + item.itemName + "

" + item.itemDesc;
return tooltip;
}
void RemoveItem(int id)
{
for (int i = 0; i < inventory.Count; i++)
{
if (inventory .itemID == id)
{
inventory = new Item ();
break;
}
}
}*_

* void AddItem(int id)*
* {*
* for (int i = 0; i < inventory.Count; i++)*
* {*
_ if (inventory .itemName == null)
* {
for(int j = 0; j < database.items.Count; j++)
{
if (database.items [j].itemID == id)
{
inventory = database.items [j];
}
}
break;
}
}
}
bool InventoryContains(int id)
{
bool result = false;
for(int i = 0; i < inventory.Count; i++)
{
result = inventory .itemID == id;
if (result)
{
break;
}
}
return result;
}
}
It its not finished but …
And heres my test of pickup
public class ItemPickUP : MonoBehaviour
{
public int distance;
private ItemDatabase database;
private Item item;*_

* void Start()*
* {*

* }*

* void Update ()*
* {*
* Collect ();*
* }*

* void Collect()*
* {*
* if (Input.GetKey(KeyCode.E))*
* {*
* RaycastHit hit;*

* Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);*

* if (Physics.Raycast (ray, out hit, distance))*
* {*
* if (hit.collider.gameObject.tag == “pickUP”)*
* {*

* Destroy (hit.collider.gameObject);*
* }*

* }*
* }*
* }*

}
i just want to know how to i pickUP the item and then it goes to the inventory

Before destroying you need to collect ID from that “pickUP” object.
Create empty script with single var String attached. And identify each item you want collected.