A great deal of work has gone into the difficult subject of braille mathematics.
Moreover it is not a subject which can be covered easily, since it does require a knowledge of mathematics as well as mathematical braille.
Additionally one needs to know how to use at least one of two software products - MathType and/or Scientific Notebook.
And as a final warning, never was the saying "Rubbish In - Rubbish Out!" more true.
If you are familiar with Microsoft Word for Windows, you may also know of "Equation Editor" which allows you to insert basic mathematical material into a Word file.
MathType is a more advanced (but low cost) version of Equation Editor which enables you to enter equations into Word documents.
Word files containing MathType equations may then be opened in DBT in the usual way, and translated into braille.
A 30 day fully working demonstration version is available for download from: http://www.dessci.com/en/products/MathType/trial.asp
A curious issue: Mathtype pays attention to whether or not you run as Administrator (run with elevated credentials). If .docx is imported from DBT that is run elevated, then DBT is quit, and then DBT run again non-elevated, then attempt to import a MathType .docx file will crash DBT. If .docx is imported from DBT that is not elevated, then DBT is quit, and then DBT run again elevated, then attempt to import a MathType .docx file will crash DBT.
This product creates its own files containing both text and mathematical material. It is possibly slightly more advanced, which in turn is reflected in the cost.
Scientific Notebook files will be recognized as such when you open them in DBT.
A 30 day demonstration version is also available from: http://www.mackichan.com/licensing.net/dnloadreq.aspx
Please note that the general use and support for these products is generally provided by the developer and not Duxbury Systems. Inc.
Issues relating to import and braille translation however can be addressed to Duxbury.