Well, you can update the value of some document properties using a field,
e.g.
{ KEYWORDS "set this to my keywords" }
or
{ INFO KEYWORDS "set this to my keywords" }
but
a. I think the merge output document will have the keywords value that
exists in the mail merge main document when you start the merge. The {
KEYWORDS } and { INFO KEYWORDS } fields will not survive
b. the Category property does not work that way (only a few of the
properties do) and no custom document properties work that way.
c. you would in any case need to decide which record's category should
determine the category of the output document.
So
d. I think you would need to use code to set the value in the output
document
e. if what you really want to do is merge to a new document then split the
document into sepparate letters/documents, each with its own category, you
might be able to adapt the approach described by Doug Robbins/Graham Mayor
at
http://www.gmayor.com/individual_merge_letters.htm
