PackTextures and DrawTexture

How do I draw a texture width the DrawTexture method that is packed with Texture2D.PackTexture?

If I can’t, how is the way of drawing the packed textures??

You can use GUI.DrawTextureWithTexCoords.

texCoords parameter is not described properly in the documentation, but generally you have to use values which were returned from PackTexture. For example, to display bottom right quarter of your texture, you need to pass Rect(0.5,0,0.5,0.5)