Create a hyperlink to a specific location in another document or Web page

To link to a location in a document or Web page that you created in Word, you must mark the hyperlink location, or destination, and then add the link to it.

Mark the hyperlink location

1. 1.    Insert a bookmark in the destination file or Web page.
2. 2.    Open the file that you want to link from, and select the text or object you want to display as the hyperlink.
3. 3.    Right-click and then click Hyperlink  on the shortcut menu.
4. 4.    Under Link to, click Existing File or Web Page.
5. 5.    In the Look in box, click the down arrow, and navigate to and select the file that you want to link to.
6. 6.    Click Bookmark, select the bookmark that you want, and then click OK.
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8. Note   To customize the ScreenTip that appears when you rest the pointer over the hyperlink, click ScreenTip and then type the text that you want. If you don't specify a tip, Word uses the path to the file, including the bookmark name, as the tip.

Add the link

1. 1.    Select the text or object that you want to display as the hyperlink.
2. 2.    Right-click and then click Hyperlink  on the shortcut menu.
3. 3.    Under Link to, click Place in This Document.
4. 4.    In the list, select the heading or bookmark that you want to link to.
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6. Note   To customize the ScreenTip that appears when you rest the pointer over the hyperlink, click ScreenTip and then type the text that you want. If you don't specify a tip, Word uses "Current document" as the tip for links to headings. For links to bookmarks, Word uses the bookmark name.

Tip   From Word documents, you can create links to specific locations in files that are saved in the Microsoft Office Excel (.xls) file format or the Microsoft Office PowerPoint (.ppt) file format. To link to a specific location in an Excel workbook, create a defined name in the workbook, and then at the end of the file name in the hyperlink, type # (number sign) followed by the defined name. To link to a specific slide in a PowerPoint presentation, type # followed by the slide number after the file name.

Source:
https://support.office.com