Is it possible to make the outline of a circle and line have no color?

I am working on redesigning the logo for the firm i work for. On that occasion i want to make a "logo profile" where i would like to include i black/white monochrome version of the logo. For the logo to be monochrome i need to make the outline of a circle and a 2-point line have no color, is this possible? And if so, how?