I don't know what IMT 3 is or exactly what you need to know about tabs and outlines, but if you are using Microsoft Word or a Word-based platform and you want to make a tabbed outline you would click format at the top of the document, select bullets and numbering, and then select the type of outline you want, be it Roman numerals, Arabic numbers, bullets, etc. If you are using Word 2010 it is a little different. I don't have it at home but am familiar with it.
I would suggest googling "how to create an outline in Word (your version)" with the quotes and see if you can get the answer.
I don't know if this is what you are asking, but if you post more information, perhaps there is someone here who can help you.