Yet another health bar request

This is not a place to ask for code to be written for you.

You should try and code something yourself but this is how I would go about it:

1. Either you need to make an Array/List of all your 'units' or you should instantiate each unit with the same script attached to it.

2. Once you have an object that needs a health bar, find its position (or a point above its position) in screen space using Camera.WorldToScreenPoint.

3. Once you have a point in screen space you can draw a rectangle using GUI.DrawTexture.

4. Scale the Texture based on the health of the unit

You should probably learn to code this if you wish to make a successful game,

A much better use of this site is to try and code it yourself and ask specific questions on sections of code

Scribe

EDIT: Attempt at code

 int maxHealth;
 int currentHealth;
 Vector3 ScreenPos;
 Texture2D MyTex;
 int MaxTextureWidth;
 
 
 void Update () {
     ScreenPos = Camera.main.WorldToScreenPoint(transform.position+Vector3.up);
 }
 
 void OnGUI () {
     GUI.DrawTexture(Rect(ScreenPos.x-((MaxTextureWidth/2.0)*((float)currentHealth/(float)maxHealth)), ScreenPos.y, MaxTextureWidth*((float)currentHealth/(float)maxHealth), 20), MyTex)
 }