peck05 was telling us:
peck05 nous racontait que :

You could use a Custom Property (File > Property > Custom tab). Type a name,
select Text type and give it a value, e.g.  "source" and click on Add.

Then, in the document, wherever you want this value, insert a field:
   Do CTRL-F9 to insert field braces {},
   Between the {}, type "DOCPROPERTY NameOfProperty" (Without the quotes)
   Do SHIFT-F9 to toggle field code to field result.

Whenever you need to change "source" to "batch", change the property value
in the File menu.