Step 1 - Import your classification
You can import a classification, directly from another .pln file.
You can import a classification, directly from another .pln file.
Select the 'Reset Classifications' button from the 4D Library menu. This will go through every single element and reset the classification for that element. Doors set 'Doors' Walls set to 'Wall' etc etc
Apply properties etc.. Your file is back to normal