Short cut = Ctrl + K.Instructions for creating hyperlinks from chapter titles to the table of contents in an e-book. Note, as shown below, the same steps can work for hyperlinking to any location in a word document.

Select the heading of the Table of Contents. Go to Insert > Bookmark. See the image below for instructions.
Then go and select the chapter title you want to link. Click Ctrl + K to bring up the Insert Hyperlink dialog box. Then on the left hand side, select “Place in this document.” Then choose the bookmark you created. You can also open the dialog box by simply selecting the chapter title, right clicking, and following through.

DETAILS

You can add hyperlinks to your document that give your readers instant access to information in another part of the same document. The hyperlink can be text or graphics. By using hyperlinks, you can provide information to your readers without repeating the same information on different pages.

To add links that jump from one part of a document to another part of the same document, mark the destination and then add a link to it.

Mark the destination

Mark the hyperlink destination with a bookmark.

Insert a bookmark

Select text or an item, or click where you want to insert a bookmark.
Click Insert > Bookmark.
Under Bookmark name, type a name.

Note: Bookmark names need to begin with a letter. They can include both numbers and letters, but not spaces. If you need to separate words, you can use an underscore ( _ )—for example, First_heading.
Click Add.

Add the link

After you’ve marked the destination, you’re ready to add the link.

Select the text or object you want to use as a hyperlink.
Right-click and then click Hyperlink . Short cut is Ctrl + K.
Under Link to, click Place in This Document.
In the list, select the heading or bookmark that you want to link to.

Note: To customize the Screen Tip that appears when you rest the pointer over the hyperlink, click ScreenTip, and then type the text that you want.

Source

Link to source page on Microsoft Site

Add hyperlinks to a location within the same document

You can add hyperlinks to your document that give your readers instant access to information in another part of the same document. The hyperlink can be text or graphics. By using hyperlinks, you can provide information to your readers without repeating the same information on different pages.

Mark the destination

Insert a bookmark

Add the link