GameObjectGenerator.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GenerateTanks : MonoBehaviour
{
    public GameObject[] bodies;
    public GameObject[] towers;
    public GameObject[] cannons;
    // Start is called before the first frame update
    void Start()
    {
        GameObject emptyTank = new GameObject();
        int i = 0;
        int j = 0;
        int k = 0;
        foreach (GameObject bodyObject in bodies)
        {
            j = 0;
            foreach (GameObject towerObject in towers)
            {
                k = 0;
                foreach (GameObject cannonObject in cannons)
                {
                    GameObject tank = Instantiate(emptyTank, new Vector3(i * 10f, 0f, (j + k) * 10f), Quaternion.identity);
                    tank.name = string.Format("Tank {0}-{1}-{2}", i + 1, j + 1, k + 1);
                    tank.transform.position = new Vector3(i * 10f, 0f, (j + k) * 10f);
                    GameObject body1 = Instantiate(bodies[i], Vector3.zero, Quaternion.Euler(-90, 0, 0), tank.transform);
                    GameObject tower1 = Instantiate(towers[j], new Vector3(0, 0f, 0), Quaternion.Euler(-90, 0, 0), tank.transform);
                    GameObject cannon1 = Instantiate(cannons[k], new Vector3(0, 0, 0.22f), Quaternion.Euler(-90, 0, 0), tank.transform);
                    k++;
                }
                j++;
            }
            i++;
        }
    }
}