How to Export BOQ (Bill of Quantity) data into excel/CSV file from Revit using A
By retrieving the elements of interest and their properties that you wish to export and writing the data into a suitably formatted text file.
The FireRating Revit SDK sample demonstrates exporting parameter data to Excel, and re-importing:
https://thebuildingcoder.typepad.com/blog/2012/09/exporting-parameter-data-to-excel.html
Many other samples both in the Revit SDK and shared by The Building Coder show both how to access BIM data and how to export it to text files.
