You can filter by your single select fields by specifying the option, for example: fieldname:option. You can filter for multiple values by providing a comma-separated list of options, for example: fieldname:option,option. For more information, see Filtering projects.
Single select fields can contain up to 50 options.
Adding a single select field
- In table view, in the rightmost field header, click .

 - Click New field.
 - At the top of the dropdown, type the name of your new field.
 - Select Single select
 - Below "Options", type the first option.
- To add additional options, click Add option.
 
 - Click Save.
 
Editing a single select field
You can set descriptions and colors for each of your single select options.
- 
Access your project's settings.
 - 
To the right of the single select field you want to edit, click .

 - 
In the modal that opens, under Label text, type the name of this option.
 - 
Optionally, under Color, select the color you want to use to represent this option.

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Optionally, under Description, type a description for this option.
 - 
Click Save to save your changes.