Problem:

I have some OBD properties that i do not want them to export to IFC. How to remove those properties to not export to IFC?

Solution:

Generally all the DG properties associated with any Element in OBD gets exported to IFC. But sometimes you don't want some properties to get exported to IFC. The IFC settings are stored at Dataset_XX/Setting folder.

Inside the folder, there is a file named, IFC_CV20Filter.set that can be used to exclude properties.Here you want to exclude the StructuralFramingCommon, Pset_PileCommon & Fire Resistance property to export to IFC, so you need to add the following line at the bottom. 

EXCLUDE_PROPERTY_SET
    Pset_PileCommon
    StructuralFramingCommon
    "Fire Resistance"

Once you add that, save the file and then export to IFC and notice the Properties are not exported to IFC. 

Attached is the example .set file and also example DGN file and IFC file. 

IFC_CV20Filter.setIFC export.dgnIFC export.ifc