Hi,
I don't know if there is another way of doing this but i use the html <MARQUEE> </MARQUEE> code to achieve this.
Here is a website that lists the marquee functions.
To enter it into TD go to layout select the cell you wish to use and type the open quote of <marquee> then click insert token which will bring up all the different types of data you can insert click ok and then close the html quote with </marquee> and job should be a good un!
I have also used images in the same way, just click the insert image button instead.
Hope this helps