Hi Randy, you can open all the documents and use the search and replace to apply the superscript to SM in all documents in a single step.
To have access to the formatting options in search and replace you have to click the more options button.
If it’s any help, there’s a Unicode code point for “service mark”: U+2120.
Might help forward compatibility if you’re going to use a font solution rather than just superscripting S and M.
It’s present in my versions of Calibri, Courier, Geneva, Helvetica, Verdana et al
I assume you mean this will be at the end of a word with no space as a ™ would be added.
If this is the case you could use GREP in you Paragraph style to do this, it will not be perfect as there are few word it will do incorrectly (eg spasm, chasm, plasm, abysm, microcosm and all words ending in ‘i’).
Most words that end in sm actually finish with ism (probably about 95%) so this uses that idea, Give it a try and see if works for you text