Look at my situation:
  - Made a report in Crystal Report 10, where I have a Master-Detail.
    The idea is simple:
     - In the Master is a printed record, where we take each item in detail the record regarding the Master. Similar to a report and request items to order.

The problem is that in my report Master, there is a field called QUANTITY, where each item of Detail substrai value of QUANTITY of the Masters. Thus, I need to make these calculations, since the bottom need the GRAND TOTAL.

Examples:

  ITEM   QUANTITY         | Report
   XYZ      43,049           | Master
------------------------------
     SUBITEM  QUANTITY | Report
        PCO           49       | Detail
------------------------------

Substrair need is the value of the quantity of the Masters with the value of the quantity in detail.

Anyone know how?

I apologize for the misinformation.

Theoretically I need is "simple". Calculate the value exists in the Master in the quantity that comes from BD, substraindo the value of quantity in the Detail.

Thus, I will do a GRAND TOTAL footer Master of the report.

In creating the report, were asked 2 SQL's - 1 for the Masters and consequently 1 to Detail --

If you know how to do this calculation (Detalhe.Quantidade - Master.Quantidade) would.