In most instances, especially during the early stages of the development of your document assembly system, you likely will be creating and adding variables to your source documents 'manually.' You will identify a proper spot for a variable, type its name and enclose it within brackets. You will repeat the cycle for each variable in the source document. You will quickly see that you can copy a variable into your 'clipboard' and repetitively paste that variable into any other location in that document.
You will soon want to adopt some of the powerful tools provided by Pathagoras listed and discussed in the below sections. These tools will help you to more rapidly and accurately convert a plain document into a fully 'Pathagorized' document.
Page url: http://www.pathagoras.com/help/index.html?inserting_variables_into_sourc.htm