Apply trees On Terrain By Script

i am trying to make a script which can save the position of the trees which has been painted on terrain and can apply it in some other project

it is still in building phase and i am unable to apply trees on a terrain here i need help i can not find any solution of how i can apply trees on terrain while i have only its position Help here would be appreciated Thanks AR

Here is my code f

 void Save_tress()
     {
         Prototype_1_position.Clear();
         Prototype_2_position.Clear();
         Prototype_3_position.Clear();
         Prototype_4_position.Clear();
 
     Terrain[]    terrian_save = (Terrain[]) GameObject.FindObjectsOfType(typeof(Terrain));
 
         foreach(Terrain Terra in terrian_save)
         {
             My_trees = Terra.terrainData.treeInstances;
             
             
             foreach (TreeInstance tre in My_trees)
             {
                 
   
                 
                 if(tre.prototypeIndex == 0 )
                 {
                     float x = Terra.terrainData.size.x * tre.position.x ;
                     float y = Terra.terrainData.size.y * tre.position.y ;
                     float z = Terra.terrainData.size.z * tre.position.z ;
                     
                     x = x + Terra.transform.position.x ;
                     y = y + Terra.transform.position.y ;
                     z = z + Terra.transform.position.z ;
                     
                     Vector3 abc = new Vector3(x,y,z);
                         Prototype_1_position.Add(abc);
                     
                 }
                 if(tre.prototypeIndex == 1 )
                 {
                     float x = Terra.terrainData.size.x * tre.position.x ;
                     float y = Terra.terrainData.size.y * tre.position.y ;
                     float z = Terra.terrainData.size.z * tre.position.z ;
                     
                     x = x + Terra.transform.position.x ;
                     y = y + Terra.transform.position.y ;
                     z = z + Terra.transform.position.z ;
                     
                     Vector3 abc = new Vector3(x,y,z);
                         Prototype_2_position.Add(abc);
                     
                 }
                 if(tre.prototypeIndex == 2 )
                 {
                     float x = Terra.terrainData.size.x * tre.position.x ;
                     float y = Terra.terrainData.size.y * tre.position.y ;
                     float z = Terra.terrainData.size.z * tre.position.z ;
                     
                     x = x + Terra.transform.position.x ;
                     y = y + Terra.transform.position.y ;
                     z = z + Terra.transform.position.z ;
                     
                     Vector3 abc = new Vector3(x,y,z);
 //                        Prototype_3_position.Add(abc);
                     
                 }
                 if(tre.prototypeIndex == 3 )
                 {
 //                        Prototype_4_position.Add(abc);
                         
                 }
                 if(tre.prototypeIndex == 4 )
                 {
 //                Prototype_5_position.Add(abc);
                         
                 }
                 if(tre.prototypeIndex == 5 )
                 {
 //                    Prototype_6_position.Add(abc);
                     
                 }
                 
                 Debug.Log(Prototype_1_position.Count);
                 Debug.Log(Prototype_2_position.Count);
                 Debug.Log(Prototype_3_position.Count);
             }
         }
         }
 
     void Apply_Trees()
     {
         Terrain[]    terrian_save = (Terrain[]) GameObject.FindObjectsOfType(typeof(Terrain));
 
         foreach(Terrain Terra in terrian_save)
         { 
             foreach(Vector3 newPOs_1  in Prototype_1_position)
             {
                 Instantiate(Tree_prefab_1 ,newPOs_1 ,Quaternion.identity);
 
             }
             foreach(Vector3 newPOs_2 in Prototype_2_position)
             {
                 Instantiate(Tree_prefab_2 , newPOs_2 ,Quaternion.identity);
                 
             }
             foreach(Vector3 newPOs_3  in Prototype_3_position)
             {
                 Instantiate(Tree_prefab_3 , newPOs_3 ,Quaternion.identity);
                 
             }
         }
 
     }