Try the *\Charformat swith.

Say your bookmark name is RefNum. Use the field { RefNum *\ Charformat }
and apply the desired formatting to the firest character "R" in the field.

--
Greg Maxey/Word MVP
A Peer in Peer to Peer Support

woodhatch wrote:
I need to place a reference number in several places on a merge
document. I have used the "ASK" statement and put in the bookmarks
and it appears on the merged document. But the format is the same for
all so if the number appears in the header and needs to be size 14,
the field will be the same throughout the document.
I know it will change because I have a merge doc that does it, but I
can't control it.
How do I get it to format how I want it?