Jay,

Many thanks for your reply.

The 0.63 mm tab stop was not part of the numbered style in Doc2.

I have read the Shauna Kelly articles.  I notice that the
"Bullets and Numbering" dialog (in Word 2000) and the
"Customised Outline Numbered List" dialog (in Word 2002 and
2003) override the styles attached to the numbering levels.

My document did link a different paragraph style to each outline
numbering level.  I imported the styles into Doc2, before
pasting in the text from Doc1.  So the issue wasn't with styles,
but with the numbering dialog.

The Word 2000 Format > "Bullets & Numbering" dialog does not
allow the user to set the position of the tab stop after the
outline number (unlike Word 2002 and 2003).

My paragraph styles start life without tab stops. Then,
when I enter and exit the Format > "Bullets & Numbering" dialog,
the paragraph style for level 1 contains a tab stop at 0.63 mm.
This is the default tab stop after a bullet - ie if I put a
bullet on a paragraph, the bullet is at 0.2 mm and the following
tab stop (and text) is at 0.83 mm, the difference being the
magic 0.63 mm. Therefore, the numbering dialog is changing the
style with this default Word setting.

I can go into the level 1 style and remove the tab stop and the
document will reformat itself OK.  But, whenever I go into the
numbering dialog, the document goes out of kilter again.

Perhaps that's why the later versions of Word allow the user to
specify the tab stop in the "Customised Outline Numbered List"
dialog.

I shall read the additional MVP material soon and see if that
helps.  Otherwise, I shall have to keep doing battle or upgrade.

Incidentally, how would I search for a tab character?  The
Format button in the Replace dialog seems only to permit
searching for a tab stop (but then the search fails to find
anything).  Also, Ctrl-Tab doesn't enter a tab character.

Thanks again for the leads.  I thought you might like to know
where they took me.

Geoff