Hi @Pilou,
thanks a lot for your reply!
The gif is so perfect to explain :)

So now I can easily export to 3D pdf also edge geometries, but still I miss a way to convert dimensions to curves...

I tried to dimension the edges, but the dimensions will be just as when dimensioning a solid... and they will not exported to 3D pdf... it seems from the DSM images on their forum that dimensions are converted to curves too...

thanks again
M