Search for "TM" and replace with "TM" (no quotes). Put the cursor in the "Replace with" field and click Format... . Under Position, select Superscript. You might not want to Replace All, or you will change things such as "uTMost"!
If I understand you correctly: there IS no way of replacing a string of characters with mixed formatting (like normal + superscript).
No, you clearly don't understand me correctly: I had just explained (above) how you do this!
You want to find occurrences of non-superscripted "TM" - even within a word, so to speak - and to superscript just the TM but leave the rest of word as it is? Just do what I suggested:
o For "Search for", enter "TM" (no quotes).
o For "Replace with", enter "TM" (no quotes).
o Put the cursor in the "Replace with" field and click Format... .
o On the Position tab, under Position select Superscript.
o Click Find and Replace as necessary to change the text.
I suggested that you might *not* want to use Replace All in this context, or you will superscript the letters "TM" where they happen to occur naturally in the text - such as in the word "UTMOST", which would get its buried "TM" inappropriately superscripted.
Incidentally, you very probably shouldn't be using two superscripted capital letters for this, but instead the single Unicode character "TRADE MARK SIGN" (U+2122), which you should find in all normal fonts. Find this at Insert | Special Character...; no need for superscripting.
I imagine that. However, xxxTM is the way the customer itself specifies its product - as a registered trademark. Would it be permissible (for me) to change that?
Perhaps you haven't looked at the trademark symbol. Its appearance is of the superscripted letters "TM", but it is a single character and is naturally raised without having to be given Superscript format. In a temperature, would you use a superscripted letter "o" or a proper degree symbol? If your client doesn't know the right way to do the trademark symbol, are you allowed to get it right?
I trust this helps.
Brian Barker