Need help with movement C#

So I have been trying to figure out how to something for movement with balls. I managed to create a script that works for one ball, but I am trying to implement a split keyboard feature. I need help so I can control two things with the same script and different keys… I did use horizontal and vertical get axis keys which is my main issue. Im trying to get the second ball to move with the keys

8
4 5 6 on the number pad

The code I used is below

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour
{
	public float BallSpeed;
	void FixedUpdate ()
	{
		float moveHorizontal = Input.GetAxis("Horizontal");
		float moveVertical = Input.GetAxis("Vertical");

		Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);

		GetComponent<Rigidbody>().AddForce(movement * BallSpeed);
	}
}

You can do this by loading a reference to your other object in your first object’s script and then detecting input with Input.GetKey along with KeyCode.Keypad#. There’s also a couple things you could do to improve general performance. Here’s an example of what an implementation of the second ball’s movement might look like:

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour
{
    public float ballSpeed = 1f;

    private GameObject secondBall;
    private Rigidbody thisRigidbody;
    private Rigidbody secondRigidbody;
    private float moveHorizontal;
    private float moveVertical;

	void Start()
	{
        //This is a GameObject named SecondBall in your Resources folder
        secondBall = Resources.Load("SecondBall") as GameObject;
        //Stores Rigidbodys in local variables so you don't have to get them every Update
        thisRigidbody = GetComponent<Rigidbody>();
        secondRigidbody = secondBall.GetComponent<Rigidbody>();
	}

    void FixedUpdate()
    {
        moveHorizontal = Input.GetAxis("Horizontal");
        moveVertical = Input.GetAxis("Vertical");

        thisRigidbody.AddForce(new Vector3(moveHorizontal, 0.0f, moveVertical) * ballSpeed);

        //Horizontal keypad movement
        if (Input.GetKey(KeyCode.Keypad4) && !Input.GetKey(KeyCode.Keypad6))
            moveHorizontal = -1f;
        else if (Input.GetKey(KeyCode.Keypad6) && !Input.GetKey(KeyCode.Keypad4))
            moveHorizontal = 1f;
        else
            moveHorizontal = 0f;
        //Vertical keypad movement
        if (Input.GetKey(KeyCode.Keypad8) && !Input.GetKey(KeyCode.Keypad5))
            moveVertical = 1f;
        else if (Input.GetKey(KeyCode.Keypad5) && !Input.GetKey(KeyCode.Keypad8))
            moveVertical = -1f;
        else
            moveVertical = 0f;

        secondRigidbody.AddForce(new Vector3(moveHorizontal, 0.0f, moveVertical) * ballSpeed);
    }

}