You could try to use smselect jquery plugin
There is an example at
https://demo-trunk.ofbiz.apache.org/example/control/FormWidgetExamples (Multiple drop-downs)
And a real use at
https://demo-trunk.ofbiz.apache.org/webtools/control/LinkGeosJacques
From: "vinay.cp" <
[hidden email]>
> Hello All,
>
> I have a drop down box in my application which has allow-multiple="true".
> After submitting the form, the value gets stored in the database in the form
> of comma separated values like {MO,TU,WE}. I have to repopulate the form
> from the database when the edit button is clicked. The drop down box does
> not get repopulated if multiple values were previously selected but it gets
> repopulated if a single value was previously selected from the drop down
> box. Could you please let me know if there is any way I could repopulate the
> drop down box with multiple values selected?
>
> Thanks.
> --
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