To use an existing data source, Preparing Data for Mail Merge
Open the main document. Then on the Mailings tab, in the Start Mail Merge group, click the Start Mail Merge button, and click Step by Step Mail Merge wizard.
In the Mail Merge task pane, select an option in the Select document type area, and then click Next: Starting document.
Select the Use the current document option, and then click Next: Select recipients.
Select the Use an existing list option, and then click Browse.
In the Select Data Source dialog box, navigate to the location of the data source, and then double-click the file.
To add a record to a data source, Preparing Data for Mail Merge
On the Mailings tab, in the ...