Go to Tools -> Launch Editor.
In the editor, go to the Languages tab, and hit the blue "New (Blank)" button in the lower left. Enter the name of the language, a unique ID for it, and a description if you like. Once you've got that sorted, hit the "Test Now" button in the upper left corner (this integrates the thing you currently have selected into the HL program). For the first thing you try to test, the program will prompt you to save the file, so do that.
Then simply Duplicate the language you just made (it is another button near New (Blank), in the lower left), changing whatever you like for those, when making subsequent languages.
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