Follow these steps to add messages to a mail file using only the controls on the Header window:
Select the mail headers that you want to move or copy to the mail file.
Move or copy the selected messages to an existing or new mail file as follows:
If the desired mail file already exists and is listed in the Move and Copy menus, simply choose the mail file from the Move or Copy menu.
If the desired mail file already exists but is not listed on the Move and Copy menus, choose the desired mail file from the Mail File menu, and then click SELECT on the Move or Copy button.
The new mail file becomes the first and default item of the Move, Copy, and Load menus.