How do I change the CMYK 0-0-0-0- white color into Pantone White? There is no Pantone white, is there?
The answer, just make a new swatch, call it something White, and set it to be a spot color.
The first question though is why do you need to do this?
But the reason I ask why you want to do this is that when sending files to be printed with white ink, generally the white is put in as a spot color on a Layer labeled “white ink,” but in a color like Magenta or Cyan so it can be seen. You really need to talk to your printer about how they prefer the representation of spot white ink.