Tools in the group Text Manipulation can be used to isolate data columns, manipulate the format of content, remove header lines, and the like.
The assumption is that you used a reference annotation file containing the appropriate attributes when running these tools. If you didn't, consider that option. One source: http://support.illumina.com/sequencing/sequencing_software/igenome.html
There are ways to map UCSC transcript IDs to other identifiers, but this is not the most direct method.
Thanks, Jen, Galaxy team