How to subtract 2 field in an Access Report?

[yosiro]

How to subtract 2 field in report like the picture below? The Access just have some option like sum, average, min, max, etc, but not subtract.

[Rabbit]

It doesn't look like you're subtracting two fields but two rows. From the picture, it looks like for each Nama, there are two ids, 1 and 2. And your goal is to subtract id 2 from id 1. You can do this by grouping by nama, returning a negative for those that have id 2, and putting a subtotal on the grouping.

[yosiro]

Yes you right, but how to return a negative for those that have id 2?

[Rabbit]

You can use the iif function for that.