G.6.5 Assign Command
If you want to avoid the trouble of defining a specific section name but rather leave it to the program to assign a section name, the ASSIGN command may be used. The section types that may be assigned include BEAM, COLUMN, CHANNEL, ANGLE and DOUBLE ANGLE.
When the keyword BEAM is specified, the program will assign an I-shaped beam section (Wide Flange for AISC, UB section for British).
For the keyword COLUMN also, the program will assign an I-shaped beam section (Wide Flange for AISC, UC section for British).
If steel design-member selection is requested, a similar type section will be selected.