Is there an auto summary tool, as in MS WORD? If so, where?

[linchave]

I am combining several letters, written at different times, on the same subject . There’s a lot of redundancy. Auto summary or MS WORD tool would be helpful in finding them and editing.

[RGB-es]

File → Send → Create AutoAbstract. This function depends on the use of styles and the document outline set on Tool → Chapter Numbering.