A line set groups multiple connected segments into a single editable object, allowing designers to manipulate contours

https://papa-wiki.win/index.php/When_to_Repair_or_Replace_an_Existing_HVAC_Line_Set

A line set groups multiple connected segments into a single editable object, allowing designers to manipulate contours, outlines, and paths with consistent thickness, style, and snapping behavior across a project.