Hide subtotal rows in Advanced PDF/HTML template

Hi.

I'm looking for a bit of help to hide rows in a table where the row contains a subtotal in the PDF output from an advanced PDF/HTML template...

In simple terms, I use subtotal items in estimates then use a markup item to add a loading for work conducted after normal business hours. An example transaction in NS might look like this;

QTY   ITEM       DESCRIPTION            AMOUNT      TOTAL
----+----------+----------------------+-----------+--------
2   | LABOUR   | Business Hours Work  | $100.00   | $200.00
    | SUBTOTAL |                      |           | $200.00
    | MU-AH    | After Hours Loading  | 20%       |  $20.00


When I render this as an advanced PDF/HTML template, I get a blank line on the SUBTOTAL row, which I want to hide (remove completely from the