Nordstrom demands so much from their employees. The company expects you to maintain your sales per hour, open rewards (solicit credit card accounts), and push preselling for Nordstrom and Cosmetic Department events in addition to your daily counter duties and expectations. That's not for everyone. A big plus is that if you perform well, one does get to advance to cosmetic lines that are more challenging.
During your interview, don't be afraid to ask questions regarding the topics I mentioned earler. Do tell them what your goals are and what you have to offer to the Nordstrom company and to the department. When/if the department manager tells you what positions are available in the department, ask if there will be a make up test or interview with the territorial manager of the cosmetic line you're applying for. That way you'll be a few steps ahead of the game and have time to prepare accordingly.
Good luck!