Combine Lines
Shortcut Key: B
Merges connecting lines, arcs, and curves into a single line entity.
Select the entities you wish to combine into a single line. All selected entities must share endpoints to form a continuous line. That is, each line entity has to be connected to the next line. This command affects currently selected entities.
This command is similar to Make Plane , but Make Plane converts the selected lines into a plane (surface) instead of a line entity.
NOTE: Since this command converts arcs into lines, any arcs will lose their center points. Curves are also converted to vectors for this operation.