Can I have multiple usernames and passwords for the same site?
Yes, you can have as many usernames and logins for a single site as you like.
When you login to a site, LastPass will detect the new username/password combination, and will offer to save this new data. Once it is saved, when you revisit the site, your multiple logins will be available to choose from the gray field icons.
Multi-page login: We always recommend using Save All Entered Data when using a multiple page login process.