Transitioning from existing Taxonomy based technology is extremely easy in Signals.
Signals supports Clarabridge's export format for taxonomy upload. If you have an existing file, it is a drag-and-drop process to upload it into Signals and run your data against it.
Open Taxonomy from the left menu of the main Portal, Click on "Upload" to select a file from your computer, and submit.
You will see your uploaded taxonomies listed on the taxonomy center.