There are several improvements in the IFC4 export, and you need to create a new standard file.

• The new Object color setting allows you to export objects using the object class colors or object group colors. If you select object group colors, the defined transparency settings are also exported.
• You can now export flat and wide beams as plates using the new option Export flat wide beams as plates. Select this option if you have modeled plates as beams or columns with flat profiles. For example, some system components use beams or columns instead of plates.
• When you select the new option Pours , concrete parts are exported as pours. If you do not select it, concrete parts are exported without pours.

For more information about IFC4 export, see Export a Tekla Structures model or selected model objects to an IFC file.