category list in custom post page ??

wp_list_categories(‘title_li=’) on default post page will display category list such as…
-Inspiration
-Photography
-Illustrator
so it can filter out the posts prior to category name.

I created custom post page called ‘Portfolio’ It displays grid thumbnails posts images. I tried to add category list using this code wp_list_categories(‘title_li=’) it worked but does not post custom category lists.

so what does this code wp_list_categories(‘title_li=’) equalvalent to inside custom taxonomy? any codes examples? do I need to register taxonomy?

[topic closed as duplicate – please continue with your original topic http://wordpress.org/support/topic/how-to-code-category-list-in-custom-post-page-need-help?replies=1 ]