TSGL: MS Word Mail Merge w/Multiple Data Sources?

[David Goldstein]

I have a mail merge that I've been using in Word for a couple of years
now that pulls data from an Excel data source.  Recently the need to
add a second Excel data source arose.  Essentially what would happen
is that a flag would be set in the first data source indicating if
data is needed from the second data source.  I already have the flag
and the logic behind it set up to display additional text if the flag
is set.  Is it possible to then pull data from a second Excel data
source?

Thanks,
Dave