What sort of form?

If you are using formfields in a protected document, each formfield will
have a bookmark name assigned to it and in the other locations where you
want the data to appear, you can insert a cross reference to the text of the
bookmark.  You will need to check the "Calculate on exit" box in the
properties dialog of the formfields so that the cross reference fields in
the document are updated with the information that is entered into the
formfield.

With that type of field however, the protection that must be applied to the
document does impact on the available features in Word and it may be better
to use a userform to gather the information from the user

See the article "How to create a Userform" at:

http://word.mvps.org/FAQs/Userforms/CreateAUserForm.htm

With that approach, you can either use code to insert the information into
multiple bookmarks (they must have unique names) or once again, you can use
a cross reference to the text of a bookmark.

You can also have the code set the value of variables in the document and
then insert the corresponding { DOCVARIABLE } wherever you want the
information to appear.