Empty space in VTF using photoshop

How can i create empty space for a VTF file on photoshop?

What? Do you mean transparency?

You want a space skybox?

I have no idea what’s being asked.

Your question is very broad and doesn’t give enough detail to identify the problem. Now there’s your problem.

You mean like whiteness? Just make a new picture, then save it as something. Then import into VTFEdit and save it.