Help with Webintelligence Crosstab format

Hi, I know this may be a silly question but the thing is I don't know how to make it work using Webintelligence. I have the following data:

I want to create a table like this:

But the reality is that if I use a crosstab table I get this,but I don´t want sales and discount together by month in this way:

There´s no way of making sales be grouped by month, then discount apart, by month.

I tried with a Vertical table and I got his:

I guess I´ll have to apply a workaround using some "WHERE" conditions in formula, filtering by month.  But that's not easy for the end user. Isn't there another alternative in order to create in a easier way the structure I want?