Simple - have your macro:
1. Mark all content as hidden.
2. Find the text you want to preserve and unhide it
3. Find and delete all hidden text.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Thanks Paul for your reply. I am not sure I understand. What I want is not to hide but discard the text completely. Finally I would be saving the document.

There is no fixed text as I mentioned in the question. It is more about start position or end position. I have these as numbers and not text. The text/character at the start position can be a "Space" or a "Full Stop".

For example, let's say I have this simple text

And I want to keep only the text from 11th position till 31st position with the formatting and delete everything. If it was an unformatted string, I could have used

This would give me the desired text "brown fox jumps over" but the formatting is lost.

Which is exactly what the process I described will achieve. Read point 3.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]

My Apologies. I was editing my reply. As I mentioned in my previous post

There is no fixed text as I mentioned in the question. It is more about start position or end position. I have these start position or end position as numbers and not text. The text/character at the start position can be a "Space" or a "Full Stop". So I can't find it or am I missing something here?

Thanks again for patiently helping me out Paul.