The adjustments and the adding of new blocks in the header file can be performed according to two variants:
1. Extending an existing header file
2. Creating a new header file.
To create a new header file, following steps are required:
•Open CAD program (e.g. ACAD).
•Save the empty file as dwg or dxf. The version number depends on the version you are working with. I.e. if the CAD drawing is saved as Version 2011, it will work for 2011, 2012, and 2013, however not for older versions.