If you're interested in a few different positions at the same company is it okay to apply for more than one?
You absolutely can and some companies even make it easy to do so! The thing to look out for though is making sure the roles are still applicable to your experience and not that you're just looking for any job. Now if you're really passionate about what a certain company does and you actually would take any job they gave you, you still want to make sure that you're presenting yourself in a light that shows you can add value to their company in many different aspects, and also that you're extremely passionate about what they do. Ideally you acknowledge that you applied to multiple roles, and you slightly customize your application to each of the roles, again to highlight your value in each of them.