I have a report and here is what I want to do. [![Odoo Report][1]][1]

  [1]: https://i.stack.imgur.com/DeLjg.png

This is from the stock-picking batch model.  

I was able to add a span line so 

    <span t-esc="move_operation.mapped('picking_id').display_name"/>

This gives me the names of the products but I need to be able to add the lines. 

I have tried 

    <t t-esc="sum(l.price_total for l in move_operation.mapped('picking_id') " />

But haven't had success.