It is very difficult or impossible to create a non-contiguous group of blocks.
100 hours in game, and the only way I can create a group with Ion drives and Large Ion drives is by renaming all the Larges to be Ion - Large so it creates a contiguous list on the left. I know that LB will allow me to select a list of blocks on the left side.
I bet there is some combination of left stick and d-pad that might back this possible, but it is super unintuitive and its making most of the testers connect a M&K to their XBox. Please give this some love.