there may be some better options to this but on quicker note I would suggest as below:
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1. In your dataprovider for "multiP" column, add the numeric base value of your list items)
for e.g. (first column is just a placeholder for example, 2nd is say your column "price");
var dp:DataProvider = new DataProvider();
dp.addItem({col1:"Col1_1", price:20});
dp.addItem({col1:"Col1_2", price:100});
dp.addItem({col1:"Col1_3", price:500});
...
...
...
dp.addItem({col1:"Col1_12", price:800000000});
grid.dataProvider = dp;
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2. Create a separate array which will contain the label values against the String key of your numbers added in step 1
for e.g:
var labeldata:Array = new Array();
labeldata["20"] = "20/40";
labeldata["100"] = "100/200";
..
..
..
labeldata["800000000"] = "800M/2B";
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3. Use the label function for multiP column to show the label values in the format you said, and apply the sortOptions as Numeric because in actual dataProvider you have the values in number :)
//multiP is your column
multiP.headerText = "Price:";
multiP.labelFunction = myLabelFunction;
multiP.sortOptions = Array.NUMERIC;
function myLabelFunction(item:Object):String
{
return labeldata[String(item.price)];
}
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Hope you'll find it useful.
