horqua:
What I do is create the line or block of text in Word - with the rest of the page blank - and run it out to PDF. I then use the Object Select tool to copy that bit of text from that PDF and paste it into the one where I want it to go (then move it to the right place on the page).
We find this can be quite useful because we are supplied the PDFs rather than making them ourselves and sometimes it would cost our clients a considerable amount of money to get the people who set the pages in the first place to dearchive the files and add the text and then run out new PDFs. Whereas it doesn't take too much time for us to add a bit of text if necessary. It is, indeed, always best to go back to the original and then rerun the PDF, but if you don't have the original available, you can't!