Replace with a Subscript
The Problem:
Word can't search and replace a sub- or superscripted character within a wordfor example, replacing "SO2" with "SO2"; instead, it just subscripts the whole word. This is a major annoyance if you're editing a technical paper where the offending term crops up dozens of times.
The Solution:
You're right, you can't do this directly with Find and Replace, because if you specify formatting for the "Replace with" text, it applies to the whole of that text. But what you can do is replace with the contents of the Clipboard. To do so, enter the text you want in your document, select it, and press Ctrl+C to copy it. Press Ctrl+H to display the Find and Replace dialog box, type the search text into the "Find what" box, and type ^c in the "Replace with" box. Word then replaces the found items with the contents of the Clipboard.
Another trick that's sometimes useful is to use two replace operations: one to isolate the text you want to affect, and the second to apply the change. This technique also works for replacing "SO2" with "SO2". In the first replace operation, replace "SO2" with "SO" concatenated to a text string that will distinguish the "2" from instances of "2" that don't need to be changedfor example, "SOzx2zx." In the second replace operation, replace "zx2zx" with a subscript "2."