You can create a new client unit from Home > New > HTML5 Builder Projects > Files > Client Unit, which will be opened on the Code view.
At Design Time
For an HTML page, use the line directly:
Note: You can actually include the script from a place other than the header, if you want to.
You can use jQuery’s getScript() method for including a client unit into another client unit or page at runtime:
If you don’t want to use jQuery, you can always write your own function to achieve the same result.