If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
I want to have one gallery category that is main and all the rest to be child category.
How to get rid of this one main category from the Expose advanced category widget list?
Have a look at this topic which explains how to hide categories: http://www.kriesi.at/support/topic/categories-will-not-hide
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