1. On the Track Toolbar, click the Edit Well Top icon . This will open the Edit Well Top Toolbar.
   
   
   
   

2. Select a formation from the Formation list, or type in the name of a new formation.

3. Select a source from the Source list, type in the name of a new source, or leave this field blank to assign a blank source.

4. Place your cursor on any track. A line will appear across all tracks in the Active Curve Color. The Depth field will display the current depth of you cursor.

5. Click to place the top.

Note: To undo the addition of a top, on the Track Toolbar click the Undo icon , or use the keyboard shortcut Ctrl + Z.

1. On the Track Toolbar, click the Edit Well Top icon .
   

2. Do one of the following:

   1. Right click on the top you want to delete and select Delete Top from the shortcut menu.

   2. Place your cursor on the top you want to delete and press Delete on your keyboard. Note: The top will change to the Active Curve Color when it is active.

3. In the Delete Top dialog box click .
   
   

Note: To undo the deletion of a top, on the Track Toolbar click the Undo icon , or use the keyboard shortcut Ctrl + Z.