Preptext preserves manually applied styling, and I think Peter Kahrel has a good script to convert nested styles (use Google). But they have nothing to do with exporting to RTF.
Do you mean you want to run a script for 1., then for 2., and then (as #3) export? There are script batch runners which will do that.
Thanks for your response....
Urgently I need Point no 1 Character Styles Preserving Script
Note: I check your script, it not create character styles for Medium Italic. Could you give any updated script
Next, If any script available to run a script 1, 2 and 3 finally export to rtf.
Thanks in advance
If you need a script that will convert ALL character-level overrides to
character styles, check out my "Create Character Styles from Overrides".
It's under the scripting tab on www.freelancebookdesign.com
However, it is not a free script.