Conditionally Hide 2 Out Of 6 Rows In A Matrix?

I just spent about 30mins searching through the forums for this and saw several posts, but I didn't find a straight answer that seems like it would work for my report. How can I add only 2 data rows to a group (to hide them via the group's visible properties) and keep the rest of the rows outside of the group, but still in the same column (vertical area), as shown:

This is the view of all rows:








Cat1
Cat2

Product A
Data 1
#
#


Data 2
#
#


Data 3
#
#


Data 4
#
#


Data 5
#
#


Data 6
#
#

Product B
Data 1
#
#


Data 2
#
#


Data 3
#
#


Data 4
#
#


Data 5
#
#


Data 6
#
#

And this is the view I'm seeking in some cases:








Cat1
Cat2

Product A
Data 1
#
#


Data 4
#
#


Data 5
#
#


Data 6
#
#

Product B
Data 1
#
#


Data 4
#
#


Data 5
#
#


Data 6
#
#