I'm having a problem with the ATENA-GID for my analysis I want to create a concrete beam with rectangular cross-section, and create a line on the upper surface of the beam to apply a line load. I don't want to use the divide function to generate a centerline by dividing the upper surface equally, I want to create a separate line in the middle of the upper surface of the volume. Is there any operation that I can do to associate this line with the volume so that ATENA-GID thinks that this line belongs to the volume element.

Thank you!