Adding a number to a numeric field is quite simple using the following field
construction

{ = 10 + { MERGEFIELD Number } }

Adding to dates is a bit more complex because you may exceed the number of
months in a year. As a result, you need the following field construction

{ IF { = 10 + { MERGEFIELD Date \@ "MM } } 13 "{ = 10 + { MERGEFIELD Date
\@ "MM" } }/{ MERGEFIELD Date \@ "dd" }/{ MERGEFIELD Date \@ "yyyy" }" "{ =
10 + { MERGEFIELD Date \@ "MM" } - 12 }/{ MERGEFIELD Date \@ "dd" }/{ = 1 +
{ MERGEFIELD Date \@ "yyyy" }}" }

You must use Ctrl+F9 to insert each pair of field delimiters { }.

For a wealth of information on date field calculations in Word, see:

http://www.wopr.com/cgi-bin/w3t/show...?Number=249902

--
Hope this helps.

Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.

Doug Robbins - Word MVP

"Pascal Duchemin" wrote in message
...
Hello,

Is it technically possible to add a value to a merged data ?

Let's say add 10 months to a date retrieved from a merged data or a number
to another merge data.

If yes, how do I do this ?


Thanks