It turned out I had incorrectly inserted nulls before I internalized the data. It all works now.
The Tekla file creation is actually quite simple once it was suggested to simply import the text file and manipulate the lines of text needed. I knew these were simple text files, but did not think how easy it would be to import and edit them. I had to write a script to export the data using Python. It all works now for beams, and the same process can be used for other Tekla text files. I posted a screen grab of the script below if anyone is interested.
