Yes. You can add as many products and catgeories whenever you wish via the admin area. Site content including your text information (we call them information pages) e.g. your home page, delivery policy page, about us page, terms and conditions, etc. can also be changed. This information is separate to your products and you can change it yourself as many times as you like. You can have an unlimited number of information pages. (depending on your package you order from us) You create them, add a title and then add your content. You can even temporarily enable or disable individual pages.