When you create a file naming template, insertingĀ tokens (such as Date, Image Name and Metadata), tells Lightroom to use that information (on a file-by-file basis) from the metadata of each individual file. If you prefer to enter your own information, either type it directly into the text entree box (this embeds it as part of the template), or add the Custom Text token (which will allow you to create a template which gives you the opportunity to enter custom text like a client nameĀ without having to edit the template).

Y’know what would be really nice? If I could similarly update metadata based on other metadata. Specifically, the IPTC title/caption. At this point, I have a custom program to go change those based on a bit of custom text and a couple metadata attributes, using regular expressions to make the required changes.
Just sayin’…