You can extend the axes of an axis group up to other objects. These objects can be other grids as well as AutoCAD® objects (e.g. lines, circles, poly lines etc).
The single axes are extended at the selected end. You may select several other objects as boundary objects. In this case, you can adjust the single axes between them if necessary.
To access the command
On the Objects tab 
Grid panel, click
(Extend axes).
Command line: _AstM4CommGridExtend
To extend axis group
- On the Objects tab Grid panel, click
(Extend axes).
- Select the boundary object and press <Enter>.
- Click the axis to be extended at the desired end and press <Enter>.
- The selected axis is extended at the selected end.
Note: The axes can be extended one by one. Press <Enter> after selecting each single axis. The extension is immediately visible. - Press <Enter> to finish.
Example:
