Selecting multiple p-solids at once

[lgswe]

I made a lattice panel 4'x8' out of p-solids. Now I want to select them all at the same time, block them and move them as a unit. The problem is that I can't seem to be able to select them as a unit. I've tried the "shift select" method to no avail. The last thing I want to do is select each one individually. Please tell me I'm missing a very basic step.