This is a very generic answer but you can’t just rename the plugin, you are also going to have to alter the add_menu_page and add_submenu_page registration code starting around line 48 and going to about line 81. You need to change at least the $menu_slug and $parent_slug, but probably want to change $page_title and $menu_title as well.
And you probably need to alter the afp_get_new_portfolio_item_page function so that one plugin does not clobber the options of another one.