You can then update the cross-references automatically after you change the text. The easiest way to update all the fields in a document is to select the entire document (press Ctrl+A or choose Edit » Select All) and then press F9 or Alt+Shift+U. You can make a cross-reference refer to a bookmark, a heading, a footnote or endnote, a figure or table, an equation, or a numbered item (such as a page number). The user creates a Cross-reference source once, and then creates in Writer references to that source by selecting the reference source from a list instead of manually typing it. For a text item in a paragraph, use a bookmark. This will create a link between the original reference source and all future references. Any changes to the original reference source will be reflected in the cross. Select the text, choose Insert » Bookmark, type the bookmark name, and click the Add button.
To insert the cross-reference, choose Insert » Reference » Cross-Reference. The paragraph number options are also available when you want to insert a cross-reference to a bookmark. In the Cross-reference dialog box (see Figure 3-25), select "Bookmark" in the "Reference type" drop-down list, select "Bookmark text" in the "Insert reference to" drop-down list, choose the bookmark in the "For which bookmark" list, and click the Insert button. Microsoft Word does not display any trailing periods in the cross-reference. For example, a cross-reference to a paragraph number formatted as 1.1.1. will not display the final period in the cross-reference. A cross-reference to a bookmark is the easiest way of keeping text updated in multiple parts of a document. If you check the "Insert as hyperlink" box in the Cross-Reference dialog box, Word creates a hyperlink that you can Ctrl-click to access the original text. (In Word 2000, you click rather than Ctrl-click.) This is useful if you might otherwise lose track of the original text.