Create dropdown fields for sign up forms

I need to know the industry that my subscribers are from. In the profile update they provide that information in an un standardized way. Can there be a drop down list so I have consistent values in that field and can sort on it. otherwise, there a lot of different names for the same industry. Ii run webinars and Go to Webinar has a dropdown list for industry so all of the lists I upload from webinar registrations (they opt into the list) has standard industry responses. This is extremely critical. I can't ask my subscribers to update their industry or it will corrupt the CC data base for that field.