I am trying to find a solution to a problem grateful for some
direction.

I have managed to configure a button in outlook to create a new email
and add specific text to the subject line by adding mailto: as an
email address and then specifying the text in the subject line.

What i need to do is to configure a button which will add specific
text "authorised" to the subject line when i click onto reply or reply
to all.

Is there an easy way to do this without creating vast vba ??