My dgn file has a rectangle shape in level 60 and I'd like to extract all elements within that shape and create a new dgn file.
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Two approaches:
Read the DGN file and use the level 60 object to clip (or filter) the other levels (using the Clipper transformer or the SpatialFilter.
Or read only the level 60 object and then use the FeatureReader transformer to read from the same DGN file all objects within (or overlapping) the rectangle from level 60.
The approach to choose is depending on the amount of objects in the file compared to the amount of objects inside the area of interest and is driven by performace.