The Mfg Orders Job Grid enables you to manually select or unselect rows (jobs) in the grid.  To select rows, click on the button:

in the top right corner of Mfg Order Job Grid to toggle the selection on as in the example below:

Once the selection is on, you can double click on a row to highlight the row.  Once you move off of that row, the row appears highlighted as in the example below where two rows are highlighted:

To keep the selected (highlighted) rows in the job grid, click on the button:

To remove the highlighted rows in the job grid, click on the button:

To highlight all rows in the job gird, click on the button:

To un-highlight all rows in the job grid, click on the button:

To toggle multiple row selection off, click on the button:

When you turn the multiple row selection off the job grid does not refresh; the jobs selected remain displayed. 

To refresh the job grid either load in a saved search or click on the button:

You can save the rows you have selected by clicking on the button:

while the selection is toggled on.  The save search will save all the jobs you have selected for later recall.