Can I edit the running head variable to select first word only?

We are using Framemaker 9.0 to generate a Company names Index as part of a large directory of manufacturers. I have set up master pages to automatically generate the first company name on left-hand pages and the last company name on right hand pages, which works fine.

Some of the company names are very long so my question is, can I modify the variable to place just the first word of the company name in the running head each time rather than the entire company name? Are there other modifiers similar to '+,' (selects the last entry on a page) that would create the desired result?

Thanks