@riccardo_vico wrote:
....IFC file I got contains a single block...
EXPLODE the block to see if it contains the ele3ments you need: if not, you'll have to re-create them from scratch yourself. Sorry, plain AutoCAD is not that type of program if your block are just lines for example.
@riccardo_vico wrote:
....s there a way to structure the elements in the dwg file so that they can then be transformed in the IFC file into distinct sub-elements?
You'd have to know what those object types are: what do they need to be exactly?
BTW a vertical version of AutoCAD (free to plain autocad subscriber to install and use) or even a different program might be better for your IFC exporting needs, rather than adding an outside software to the mix that may or may not work so well