Access to the command over
Command line: _extend
Assistant: 
| CAD-Functions | 
Example:
The left line shall be extended to the right line.
After activating the function, pick the object until that the line shall be extended.
After confirming with right mouse-button pick the extending object.
The left line has been extended.
Confirm with "Enter" to finish the function.
Näheres entnehmen Sie bitte der CAD Hilfe.