zoom in when done. Add the comment and save the new mark-up entry and the corresponding attached view as a BCF file. Click the Import/Export button and demonstrate exporting. Name the file as ‘bcfA’. Do not actually export. This is a very compact file format that can be comfortably sent as an email attachment to your partners. Now let’s continue this workflow and examine how BCF files are managed in the structural engineer’s office. Switch to Tekla BIMsight.