Can I see Sales Monitor at the line item detail level?

No, Sales Monitor does not display line item detail, but here's a Quick Report (no UDFs required) that will display Sales Line Detail by Workflow Queue:
 

<report name="Sales Line" AutoLinks="true" autoRun="true" BestFitAll="true">
<search name="Warehouse" column="Wareshouse_Code" searchOp="like" />
<query addWhere="true">
SELECT
sl.Sales_Doc_Num,
sl.Sales_Doc_Type,
sl.Source,
Item_Number,
Sales_Batch,
sl.Warehouse_Code
FROM
spv3SalesLineItem as sl (nolock)
join spv3SalesDocument as sd (nolock) on sd.Sales_Doc_Num = sl.Sales_Doc_Num and sd.Sales_Doc_Type = sl.Sales_Doc_Type
/*where*/
</query>
<column name="Source" Visible="false"/>
</report>