Advance Steel is made based on the Autodesk AutoCAD engine, which is why you can use AutoCAD commands. The basic AutoCAD commands are not shown in the Advance Steel Ribbon. Below is the basic CAD commands list, which comes in very handy in Advance Steel.
Move (M+Enter)
Rotate (RO+Enter)
Copy (CO+Enter)
Mirror (M+Enter)
Stretch
Scale (SC+Enter)
Trim (TR+Enter)
Extend (EX+Enter)
Fillet (F+Enter)
Chamfer (CHA+Enter)
Blend Curves
Erase (E+Enter)
Offset (O+Enter)
Array (AR+Enter)
Explode
Lengthen
Break (BR+Enter)
Break at point
Join (J+Enter)
Edit Hatch
Edit Array
Edit Polyline (PEdit+Enter)
Edit Spline
You can type in the entire command into a Command Window, or you can use the shortcut and press Enter: