Depaul,
All formatting in the structured document is determined by its element structure. Any text range, whether its a single character in the Symbol font, or several emphasized sentences within a paragraph, that you want to preserve in the structured document need to have a character tag that your conversion table can map to an element. There are a couple of ways you can assign such a character format:
1. In the unstructured document, create a new character format for this purpose. Apply the format to one place where it's needed. Use Edit > Copy Special to copy the format to the clipboard. Then, in Find/Change, search for the Symbol font family, in the Change pull-down menu select By Pasting and click Change All. You can change an entire book this way. It is wise to make sure you have a backup first.
2. File > Utilities > Create and Apply Formats makes sure every variation of a character and a paragraph format is tagged. For example, if you have three untagged font changes, this command might create a format called CharFnt for the first one, CharFmt1 for the second, and CharFmt2 for the third. If you have one particular paragraph tagged Body that is set to start at the top of the place, this command might create a format called Body1 and apply it to this paragraph.
Create and Apply Formats can be very useful. Use with care, because the formats it creates for different files, even in one book, will be different depending on the vareiant formats it encounters in each file. You can use it in one file, import formats from that file into the next one, and then use the command in the second file to ensure that variations that occur in both files will be tagged the same way. Then import formats from the second file into the third one and so forth.
Once all your formatting changes are tagged, modify your conversion table to account for your new formats and structure your documents again.
--Lynne