Replace existing values by taxonomy terms
It’s possible to replace existing literal values by links to taxonomy terms by using the batch edit tool:
Search for items, item sets or media,
Select Edit all or Edit selected in the Batch actions dropdown list,
Click Go
In Replace literal values by taxonomy terms (properties) select the properties you want to modify,
In Replace literal values by taxonomy terms (taxonomy), select the taxonomy containing the desired terms,
Click on the Save button.