Hello Rolando,
A range of UK "castellated" profiles ( with the correct depth and name) is already available in Advance Steel: UK Castellated Universal Beam and UK Castellated Universal Column.
To model the voids (the openings) you can then use the Advance Steel “Beam features” commands: Rectangular contour, circular contour, polygon contour, …
You can also just create one opening and copy it along the beam with the Advance copy command.
Best regards
Philippe
