Only Administrators can set up story filters.
Story filters help people find stories. They are fields that people fill in for a story, and that can be used as filters on the Stories page.
You can also give the Company Library its own structure (see Company library categories & filters). The difference: the Company Library has categories and filters, stories only have filters.
Add a story filter
Go to Settings > Filters & Categories and open Stories.
Click Add Filter.
Give the filter a Name.
Choose the Type: Text, where people type a value, or List, where they choose from a list. You can't change the type later.
For a list, add each option under List Item Name and click Add.
Save the filter.
Activate a filter
New filters appear under Unassigned Filters. Drag a filter to the active list to use it. Active filters are required by default. To make one optional, open it from the active list and turn off Required.
Edit a filter
Open a filter to change its name or its list options.
Where people fill in story filters
In Story Settings: click the story title in the Composer, or choose Edit in a story's menu on the Stories page.