How to enable search via description

@Harry  Below is the simple code that you need to add to get the required functionality.

Also attached sample customization package, you can deploy in your instance and verify.

using PX.Data;
using PX.Objects.IN;

namespace PX.Objects.EP
{
    public class TimeCardMaint_Extension : PXGraphExtension<PX.Objects.EP.TimeCardMaint>
	{
		#region Event Handlers 

		[PXMergeAttributes(Method = MergeMethod.Merge)] 
		[PXDimensionSelectorAttribute("INVENTORY", typeof(Search<InventoryItem.inventoryID, Where<InventoryItem.itemType, Equal<INItemTypes.laborItem>, 
			And<Match<Current<AccessInfo.userName>>>>>), typeof(InventoryItem.inventoryCD), DescriptionField =typeof(InventoryItem.descr))]
		protected virtual void EPTimeCardSummaryWithInfo_LabourItemID_CacheAttached(PXCache cache)
		{
		} 
		#endregion
	}
}