You are welcome to catalog eBooks in Edelweiss if your reps and/or customers need full access to their title data in Edelweiss. Cataloging eBook versions of titles would make them searchable on Edelweiss, and they’d show up for users who may create search filters specifically for eBook formats.
A more common alternative is to add eBooks exclusively as Related Products. They will then only appear within the Related Products section of a title’s main listing that you’ve cataloged, and accounts will still have the ability to add them to an order via the Export Preview screen.