BING EXTENSIONS
Extensions are add-ons for your advert. You should add as many extensions as possible to your advert. The more extensions, the higher your Bing Ad position and the higher your CTR (Clickthrough Rate).
Click on "Ads and Extensions" on the left vertical menu.
Now click "Extensions" on the left vertical menu.
Select the Type of Extension from the drop-down list, which is small red circle(below on diagram), next the word "view:"
Select your Extension (Action, App, Call, Callout etc)
Now click the blue + Create button
SITELINK EXTENSIONS
These are links to other pages of your website. These links appear on your Microsoft advert and allow users to click directly to a specific page.
Click on the blue +CREATE button
Type in your Sitelink Text
Add your Final URL- the webpage where you want to direct your traffic to.
Repeat the process with different pages of your website and click Save