With these steps you get it very fast:
Copy everything from your old manual except the title page and the table of contents
Delete contents from new manual but leave the title page and the table of contents there
Paste your content and check that formatting is correct and images are in place
Update the page properties with your extension key, e-mail-address, name, language, tagging.In the moment the language- and tagging-properties are not in use by the TER, but findable by search.
Reload the table of content (right click update index table)
Insert your extension key below the document title
Ready.
Hint: When the header-styles are still in the old layout then clear and re-assign the new style. Get help from http://documentation.openoffice.org
