Hi, Dave,
You're lucky that I have my mind-reading machine turned on today.

Your
French-to-English translation isn't quite right. In English versions of
Word, what you call 'models' is translated as 'templates'. Also, instead of
'stocking', use the term 'storing'.
When you open the Tools > Macro > Macros dialog, the 'Macros in' dropdown
has two purposes:
First, it controls how Word creates the list of macros shown in the dialog.
When it is set to 'All active templates and documents', the list includes
the macros in Normal.dot, the macros in all add-ins (see the list of add-ins
in the Tools > Templates and Add-Ins dialog), and any macros in the active
document itself. If you change the dropdown to 'Normal.dot', the list
excludes macros from add-ins or from the active document.
Second, it controls where a new macro will be created if you type a new name
and press the Create button. For this purpose, the setting 'All active
templates and documents' works the same way as the setting 'Normal.dot' --
that is, either setting will cause the new macro to appear in Normal.dot.
You are correct that storing a macro in Normal.dot makes it available in all
documents, regardless of which template the document is based on. If that's
what you want, do it that way. A macro that is stored in a global add-in
(that is, a template stored in the Word Startup folder) will also be
available in all documents; there are some differences in behavior for
macros named AutoExec, AutoNew, or AutoOpen depending on where they're
stored (see
http://word.mvps.org/FAQs/MacrosVBA/DocumentEvents.htm).
Sometimes it's desirable to have macros that are available only in documents
based on a specific template. In that case, you should put the macros into
that template instead of Normal.dot or a global add-in.