wizard - How to intuitively display steps in a dynamic context

I am creating a new wizard, and depending on the choice on the first wizard step maximum 2 more steps are needed. The reason for this is that the user can select an existing object in the first step or choose to create a new one:

Step one:
Pick Layout: New or Existing
Pick Type: New or Existing

I visualize all the steps in the top of the window, so what is the best way to visualize these optional steps?

A) Show them and skip them when the user chooses to select an existing one

^{download bmml source – Wireframes created with Balsamiq Mockups}

B) Don't show them and let the appear when the user selects to create a new one

^{download bmml source}