Click the Grid Editor | Tools | Eyedropper command to pull grid Z values by clicking in the grid. The cursor changes to an eyedropper when the Eyedropper command is clicked. The Grid Editor | Tools | Eyedropper command button is highlighted in yellow to indicate eyedropper tool mode.
Click on the grid with the eyedropper to place the nearest grid node's Z value in the Z value box.
Press ESC or click another Grid Editor | Tools command to end Eyedropper mode.
The Z value box in the tool options bar at the top of the grid editor window displays the Z value from the nearest grid node when you click the grid.
After pressing ESC or clicking the Grid Editor | Tools | Select command, the grid node nearest your most recent click is made the active grid node.
You can use the Eyedropper tool to set the Z value box value for the Brush tool with two different methods:
Click the Grid Editor | Tools | Eyedropper command, and click on the desired grid node to place its value in the Z value box. Next, click the Grid Editor | Tools | Brush command.
After clicking Grid Editor | Tools | Brush to enable brush tool mode, press and hold the "i" key to temporarily enable Eyedropper mode. While holding the "i" key, click on the desired grid node to place its value in the Z value box. Release the "i" key to return to Brush tool mode.
Select - Grid Editor
Smooth - Grid Editor