Edit ifc files

Hello, 

it is possible to edit ifc files in AECOsim or Open Building Designer?

If problems occur, can you tell me which ones?

I need a detailed list of problems that might occur, like problems with cutting objects, hatching, grab and move single elements/objects (this isn't possible with a reference file, does it?), is property information lost during transmission or problems with the reference point. 

Thank you very much in advance.