I'm new in the BonitaSoft World. I have a doubt, can i change the portal? I'm not mean to change the css (and i want to change the css too), i want to know if i can change the options that the users see, and i want to decide what options a user can see. Is it Posible?
If you want to change the whole portal, you can use the Rest API to create a similar UI from scratch. By using the REST API you will be able to connect your application to the Bonita Engine.
You will find all about the REST API in the link below
http://documentation.bonitasoft.com/product-bos-sp/web-rest-api-1
Bonitasoft empowers development teams with Bonita, the open-source and extensible platform to solve the most demanding process automation use cases. The Bonita platform accelerates delivery of complex applications with clear separation between capabilities for visual programming and for coding. Bonita integrates with existing solutions, orchestrates heterogeneous systems, and provides deep visibility into processes across the organization.