Custom SidePane on Support Portal

How can i create a custom view in the side pane of the sugarCRM portal (see image)? is it the same as with the base portal?(modifying/creating  a JS controller, a PHP metadata file, and a Handlebars) if so should i change:

viewdefs['base'] >  to < viewdefs['portal'] > in the PHP metadata file .

Customer support portal SidePane

Notes: i'm using Sugar enterprise V9.0.0