different sub-sets of a list ruled by sliders

Hi! I've create a box-grid in GH, let's say a (10colums * 5rows) grid ... or more: dimensions are setted by sliders.
So, I have to manage a 50 elements List. This is a flatten list, output of the Box component.
I need a little help to obtain a preview of a sub-set of these 50 items, via GH components, without using Rhino command "selection" because the items may intersect each other.
eg I'd like a preview of items defined in rows #1 and #2. Then I'd like a preview of items defined in rows #3 and #4, ... and so on ...till rows 9 and 10.

Is it possible obtain these different sub-sets via GH components? managing a slider? the "cull" component?

My following target is to bake separately these sub-sets and copy them in different layers.
See the attachment. Thanks.