ServiceNow Create Clickable Link in Portal Page (Catalog Item)

To create a clickable link within a ServiceNow portal catalog item, use a "Rich Text Label" variable type, allowing you to embed HTML and create a hyperlink using the <a href> tag

for an external link, if you find that by default it is appending the instance url as a prefix to the external url resulting in a broken link, then modify the HTML of the Rich Text Label (via the editor) and change it as follows:

Information page