The feature described in this Help topic is only available if support for Japanese, Simplified Chinese, Traditional Chinese, or Korean is enabled through Microsoft Office Language Settings.
How?
On the View menu, point to Toolbars, and then click Customize.
Select the characters or numbers you want to laterally combine within the vertical text, and then click Combine Characters .
Tip
To undo the combined characters or numbers, select the characters or numbers that are laterally combined within the vertical text, and then click Combine Characters again.