This is the HTML web resource for converting option set to Multi Select pick list in Microsoft Dynamics CRM
Follow the steps below to use the HTML/JavaScript to build your own web resource and have a functional multi select pick list in CRM:
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Create two custom attributes to store the value and label of the option set.
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Add both attributes on form, this is required, it is not required to show those attributes on form, you can hide these fields but these are required on the form.
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Add latest JQuery library in form library.
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Create HTML web resource and add the code in HTML web resource.
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Save and Publish your changes.