If this command is not listed, you must run Tools / Add-Ins
In the dialog box, specify:
search type (maximum value) in field altering cell: $B$2:$D$2
in field Limits add limit
Field should read as follows:
$B$2:$D$2>=0 $G$6<=$F$6 $G$7<=$F$7
$G$8<=$F$8