When defining the flexible hose style, you decide whether you want the fittings placed into a flat structure or a subassembly.
All parts are independent components placed along with all other components under the pipe run. There is no subassembly.
All parts are grouped into a subassembly under the pipe run.
Structures are typically determined by how the hose route parts are purchased, assembled, and represented in manufacturing documentation, such as Parts Lists and Bills of Materials (BOM).