If you select an object in Design view that contains child tags—for example, an HTML table—you can quickly select the first child tag of that object by selecting Edit > Select Child.
For example, the <table> tag normally has <tr> child tags. If you select a <table> tag in the tag selector, you can select the first row in the table by selecting Edit > Select Child. Dreamweaver selects the first <tr> tag in the tag selector. Since the <tr> tag itself has child tags, namely <td> tags, selecting Edit > Select Child again selects the first cell in the table.