You can do this with find/replace and can also record it if you want it as a macro. Basic process is:
1. Show all field codes (by pressing Alt-F9)
2. Do a find/replace and search for "seq table" and replace with the style
3. Do a find/replace and search for "seq figure" and replace with the style
4. Reveal all field values (by pressing Alt-F9)

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Andrew Lockton
Chrysalis Design, Melbourne Australia