How to Export Admin Grid Only for Selected Fields in Magento

Create a separate block definition - e.g. duplicate the Grid block to another block that's specific for your CSV; I would call this Csvgrid.php instead of Grid.php - it would contain all of the same functionality that the normal Grid.php contains, but omit the one column.

In your controller:

public function exportCsvAction()
{
        $fileName = 'myreport_'.date('Y_m_d_h_i_s').'.csv';
        $content = $this->getLayout()->createBlock('mymodule/adminhtml_reports_csvgrid')->getCsv();
}

When duplicating the Grid, place Csvgrid.php into the same physical directory as Grid.php but rename it accordingly - don't forget to change the class name!

Edit:

So it turns out that Mage_Adminhtml_Block_Widget_Grid has a method called removeColumn - defined as:

/

**
     * Remove existing column
     *
     * @param string $columnId
     * @return Mage_Adminhtml_Block_Widget_Grid
     */
    public function removeColumn($columnId)
    {
        if (isset($this->_columns[$columnId])) {
            unset($this->_columns[$columnId]);
            if ($this->_lastColumnId == $columnId) {
                $this->_lastColumnId = key($this->_columns);
            }
        }
        return $this;
    }

My guess is that because Mage_Adminhtml_Block_Report_Grid extends Mage_Adminhtml_Block_Widget_Grid it inherits this method and should be able to be used. I would, in that case, create a new block Grid and extend the Grid that your current report is in. From there you can use your own prepareColumns method, call the parent::_prepareColumns() and then call removeColumn..

Best of luck.

Here is a tutorial

http://www.atwix.com/magento/inline-editing-in-magento-backend-grids/

It suggests you override the column renderers

Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Input

to allow inline editing, it will save the data as each control is edited rather than at the end with a save button.