Oh, my God! It's working... It's simplest that I figure...
Thanks for your support, now the mobi creation from OOo files is almost perfect!
Just one more question. What about ticket #1730 ? The mobi (and epub, too) files creation, ignoring the line and page breaks. Using other tools like Mobicreator, the page and line breaks are retained, but not with Calibre. This generate a less readeble mobi (and epub too) files.