To create an imperfection based on a mode shape, the “Structure Stability” add-on is required.
After the governing mode shape has been determined in ULS using the “Structure Stability” add-on, it is necessary to copy the mode shape into the “Load Combinations.” Only then can the mode shape be applied as an imperfection using the following options:
“New Imperfection Case”
“Buckling Mode”
The procedure is described in the video.