How to make a copy of the data

SO, I have an item database where I store all my items I am creating into a list and then I have an inventory script which puts the info onto my icon's Data script. I created away to be able to stack the items up, but when I do, but it modifies the values on the icon as well in the Item Database. I want it to make a copy of my item data from my item data base and then put that onto my icon data, so when I stack my items, it only modifies the icon data and not the data from the item database.

Inventory Script: using System.Collections; using System.Collections.Generic; using UnityEngine;

public class Inventory_2 : MonoBehaviour { public Transform SlotsHolder; public Slot_2[] Slots;

 private List<Item> _organizer;

 private void Update()
 {
     if (Input.GetKeyDown(KeyCode.Q))
     {
         AddItemtoInventory(new Item("", 1, 1, null, ItemType.Item));
     }
     if (Input.GetKeyDown(KeyCode.E))
     {
         AddItemtoInventory(new Item("", 2, 1, null, ItemType.Item));
     }
 }

 private void AddItemtoInventory(Item _newItem)
 {
     Slots = SlotsHolder.GetComponentsInChildren<Slot_2>();

     for (int i = 0; i < Slots.Length; i++)
     {
         if (Slots[i]._infoHolder.itemName == null)
         {
             for (int d = 0; d < ItemDataBase.Database.Items.Count; d++)
             {
                 if (ItemDataBase.Database.Items[d].itemID == _newItem.itemID)
                 {
                     Slots[i].AddItem(ItemDataBase.Database.Items[d]);
                 }
             }

             break;
         }
     }
 }

}

Slot Script: using System; using UnityEngine; using UnityEngine.EventSystems; using UnityEngine.UI;

public class Slot_2 : MonoBehaviour, IDropHandler { public Item _infoHolder;

 public GameObject _itemIcon
 {
     get
     {
         if (transform.childCount > 0)
         {
             return transform.GetChild(0).gameObject;
         }
         else
         {
             return null;
         }
     }
 }

 private void Start()
 {
     AddItem(new Item());
 }

 private void Update()
 {
     if(_itemIcon != null)
     {
         _infoHolder = _itemIcon.GetComponent<IconData_2>()._itemInfo;
     }
     else
     {
         return;
     }

     if (_infoHolder.itemName != null)
     {
         _itemIcon.SetActive(true);
         _itemIcon.GetComponent<Image>().sprite = _itemIcon.GetComponent<IconData_2>()._itemInfo.itemIcon;
         _itemIcon.transform.GetComponentInChildren<Text>().text = _infoHolder.itemAmount.ToString();
     }
     else
     {
         _itemIcon.SetActive(false);
     }
 }

 public void AddItem(Item _newItem)
 {
     _itemIcon.GetComponent<IconData_2>()._itemInfo = _newItem;
 }

 public void OnDrop(PointerEventData eventData)
 {
     if(eventData.button == PointerEventData.InputButton.Left)
     {
         if(_itemIcon == null) 
         {
             IconDrag_2._icon.transform.SetParent(transform);
         }
         else
         {
             if (IconDrag_2._icon.GetComponent<IconData_2>()._itemInfo.itemName == _infoHolder.itemName)
             {
                 _infoHolder.itemAmount += IconDrag_2._icon.GetComponent<IconData_2>()._itemInfo.itemAmount;
                 IconDrag_2._icon.GetComponent<IconData_2>()._itemInfo = new Item();
             }
             else
             {
                 _itemIcon.transform.SetParent(IconDrag_2._icon._orginalParent);

                 IconDrag_2._icon.transform.SetParent(transform);
             }
         }
     }
 }

}