How can I enable the "portfolio categories" in URL?
Afaik this is not easily possible because WP does not support this slug structure (Kriesi used it before WP3.3+ but then it broke the permalinks and we switched to the current structure). I'll tag this thread for him and the rest of the support staff - maybe someone can provide a working solution.
I just played around with this plugin 'Custom Post Type Permalinks' http://wordpress.org/extend/plugins/custom-post-type-permalinks/
using the setting
and I had some success with making propulsion.wp.dev/portfolio-item/css/portfolio-css-item/ ... There are some issues but I haven't spent the time reading the directions. There is also a second plugin I haven't looked at. You should take a look and play around with it, perhaps the forum for the plugin can offer assistance as well..
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