In Writer 2013, if you have already generated a table of contents in the document, you can add text without a heading style into the TOC. To use this function, follow the steps below:
Step 1 Select the text that you want to add to the table of contents.
Step 2 Open the References tab and click the TOC Level icon.
Step 3 Select the level you prefer.
Figure 1 Select Table of Content level
Step 4 Update the TOC by choosing the Update entire table option.
Figure 2 Update Table of Content
Step 5 Repeat step (1) to step (4) until all the intended text is displayed in the table of contents.