Usually an  internal anchor link  is used to create some sort of in-page pagination. Clicking on a internal anchor link  will scroll the current content to a specific part of the layout.

Let's assume that we want to have 2 menu items:

Add the links following the information above. The result should look like this:
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2. Go to Appearance > Widgets and create a new Custom Widget Area
3. Add the new Custom Widget Area place the Navigation Menu widget
4. Select the Menu created at step 1
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Now we are ready to display this menu into our page layout. Edit your page and add the Sidebar module. There are few settings to be done for the Sidebar module:

The final step is to edit the sections to which we want each of our anchor link  to scroll to and set the appropriate CSS ID.

For each section, edit it's settings and go to Advanced tab > CSS ID and enter:

In a code module in the same page where the section to which we want to scroll to add the following HTML code:

Make sure that in your page's layout there are sections with the corresponding CSS ID:

In a text module add each text into a separate line like so:

Select each of the text lines and add a link to each of one of them, entering each CSS ID of the Section to which we need to scroll to:;