You need the workshop to do that. I think your only choice (besides restarting the game) is to turn cheat codes on in Preferences and add them from there.
According to the fan-made guide, you might be able to get them from the junkyard as well, but I could not find anywhere to do so.
EDIT: Now that I remember, Rose gets access to Bernard's shop when he's not available. Not sure if she also gets Logan's?