unity - How to access arrays of prefabs and other properties through the inspector in a given hierarchy

The script below is added to an empty game object WeaponGroup, which can be populated using the editor. I have made a new game object WeaponGroups which should have a script SetupWeaponGroupsScript. How can I transfer the properties below so that each WeaponGroup (SetupWeaponGroupsScript will have an array of WeaponGroup objects) is setup in a way similar to what is done below, so that I make the SetupWeaponsScript properties hidden to the inspector and populate them through SetupWeaponGroupsScript?

public class SetupWeaponsScript {

// Here's our tuple combining a weapon prefab and a direction.
[System.Serializable]
public struct DirectedWeapon {
    public WeaponScript weapon;
    public WeaponScript.Direction direction;
}

// The prefabs array is now this tuple type.

public DirectedWeapon[] weaponPrefabs;
public WeaponScript[] weapons;

void Start ()
{  
    weapons = new WeaponScript[weaponPrefabs.Length];

    for (int i = 0; i < weaponPrefabs.Length; i++)
    {
        // Using typed Instantiate to save a GetComponent call.

        weapons[i] = Instantiate(weaponPrefabs[i].weapon);
        weapons[i].weaponDir = weaponPrefabs[i].direction;
    }      
}  
}

In other words I'd like to have the following hierarchy in the editor: