Two Simultaneous Roles?

I was just browsing through the articles on the site, and I found a lot of great
tips. However, I didn't see anything about what you should do
if you audition for two shows and get parts from both shows. How do you
know which show to take, and how can you reject a show and not make a bad
impression on that casting director about your commitment?
-Natalie

What do you do when you book two roles?

Dear Natalie: First off congrats on booking two roles. As this can be good for the ego, it's not a habit I would get into. Hey we're actors, we'll audition for everything we feel we are right for. Nothing wrong with that. The only issue is when we commit during the audition (or when they offer the role) that we have no conflicts and then later turn them down. It's obvious the impression that leaves on the casting director. Now to answer your question, very quickly accept the role that will do the most for you as an actress, that you can really throw yourself into, the role you HAVE to have. Immediately upon doing that, contact the other casting director and let them know you can't accept the role, don't offer a reason unless they ask. Don't lead them on, they need to find another actor for that role. They understand that part of the business, that other things come up for actors. What they don't understand is if you wait until the last minute (for them) and then tell them you can't do the role and put them up against the wall time wise. Timing is key here. I hope this answer helps....

More Than One Role?

More than one role at a time brings to mind working in rep, which I did summer of 02 in WI and that is the best way to learn how to learn lines and keep roles fresh but your question wasn't really about how the topic was worded. I recall Carol Brunett saying that the best advice she had was to never take a job based on the money alone. She had an offer for Vegas for great money but also an offer for an Off-Bway gig for scale. George Abbot was directing so she took that and it was of course Once Upon A Mattress.
On the rare times I have potential conflicts or even when I don't have a conflict but want some time to think I ask the person calling when I need to let them know. Depending on the time line 24 to 36 hours can be granted to you. As a rule most theatre pros understand that a better offer should be taken and most contracts give you a way out with some sort of notice. Few places you will want to work at will begrudge you taking a better job. If the role is a lead vs ensemble, will give you points toward your card or is that dream role you have always wanted.
I hope someday to get an offer in the room but so far I have not. Personally once I sign a contract I stand by it and have had to refuse work because the contract was signed the day before. It is good to have a rep of keeping your work but until the contract is signed you do have more options. The important thing is to work, work and work and if one offer will lead to more work then think about that one. It is nice having repeat roles at the same theatres on the resume.
All the best, MJ