I got this from the internet, but I don't know how to set the content of the options, and how to appear. Can be described in detail, thank you!
1), before starting the operation, please click the Office button in the upper left corner of the window to open the Word options, in the General window, tick the Ribbon Display developer tab check box, click OK to return to the main interface.
2), Word will add a new development tool tab, after switching to this tab, position the cursor to the cell that needs to be added drop-down list,
3), click the drop-down list button for the control's feature group, and a drop-down list field is automatically inserted in the current cell.
4), click the Properties button in the Controls feature group to bring up the Content Control Properties dialog box.
5), here can design the title and mark, click the drop-down list property next to the Displayvalues item, enter the appropriate content, click the OK button to close it.
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After you add a cell in Word to the drop-down box control, select the control, and then click the Developer tool-----control----property in the upper toolbar, and a drop-down list property appears below the page that pops up, and the right side of the editing area has a button to delete, modify, add option values, modify
Source: Http://zhidao.baidu.com/link?url=CZiAWxzI985eN6a6x99m1e8WCoEVlqgY1CtmxOWTlIdaZn94_WOqoLcEegd4W0ardeWQQMPb0sQvDjIL8w9kFK
Adding modified components in WORD2007