I have a Eurail select pass for three countries. I will arrive in Paris via the train. I will have an extra day on my pass and read that you can use the RER with the pass. Is there any way to do this without going to the airport RER station? I wanted to take this back to the airport, not from the airport.
Your pass is good on the RER B between CDG and Gare du Nord, but not any farther south on the B line than Gare du Nord. You should be able to use it to go from Gare du Nord to CDG. If for some reason that doesn't work for you, a single ticket from anywhere in central Paris to CDG is €8.50 and includes transfers from the Metro and/or other RER lines to the RER B to CDG.