When a text-based attribute is created, it becomes available for searching using Quick Search or Local Search.
Searching custom attributes
Quick Search: Precede the name of the attribute with "attrib_" and then add a colon followed by the query term, e.g. "attrib_color:blue".
You must use whole words when searching for elements containing particular values for local attributes.
For searching purposes, words are the terms on either side of a space, hyphen or underscore in a name. The names of elements and folders are split into words when indexing.
In the Local Search () tool, the local attributes are available to select from a drop down list, in addition to Name and Path.
Read more about search here: http://resources.qiagenbioinformatics.com/manuals/clcgenomicsworkbench/current/index.php?manual=Local_search.html.