Hi @SyncWizard ,

Try this code.

<?xml version="1.0" encoding="utf-8" ?>
<j:jelly trim="false" xmlns:j="jelly:core" xmlns:g="glide" xmlns:j2="null" xmlns:g2="null">

	<g:evaluate>
		var options = [];

		<!-- Get all the demand tasks assigned to this group -->
		var dmnTaskGR = new GlideRecordSecure("dmn_demand_task");
		dmnTaskGR.addQuery("assignment_group","cc4909c41b92edd019f6740f8b4bcbd1");
		dmnTaskGR.query();
		
		<!-- Get a unique list of short descriptions from these demand tasks -->
		while(dmnTaskGR.next()) {
			var shortDesc = dmnTaskGR.getValue("short_description");
			if(!(options.indexOf(shortDesc) >= 0)) {
				options.push(shortDesc);
			}
		}
	</g:evaluate>
	<select aria-required="false" aria-labelledby="Short description:" name="shortDescInput" id="shortDescInput" style="; " class="form-control">
		<option value="none">--None--</option>

		<!-- Create an option value for each unique short description value -->
		<j:forEach var="jvar_options" items="${options}">     
			<option value="optVal">${jvar_options}</option>
		</j:forEach>
	</select>
</j:jelly>

Please mark my answer helpful/accept as solution if it helped you 👍✔️