Here's what I'm looking to do :
Suppose you have a 3x3 grid, with each box in the grid being a vector. I want to make a new layer on top of that in which each column of 3 boxes is its own vector in the new layer. I'm interested in doing this for all of the vector data in the previous layer (i.e. grouping it into larger chunks).
How do I do that?
Using QGIS for desktop.