From a QCAD user:
How can I turn individual lines / arcs into one single polyline?
From a QCAD user:
How can I turn individual lines / arcs into one single polyline?
You can automatically create a polyline from connected segments using the context menu:
You can extend an existing polyline on both ends with the loose entities that connect to it:
To create a polyline from loose lines / arcs, you can also use the tool:
Draw > Polyline > Polyline from Segments
Or, to create a polyline or multiple poylines from all selected entities: