This is the tech combat dwarf lists have been using
Are they? Is that common?
it's a thing in linehammer, you start in two ranks and open larger using drilled, 5 models per move.
we can do it too, 40 veteran drilled halberdiers are 360, plus another 15 for full command group. Start 20 wide and open to 20, 30 when charging or pursuing.
Teutogen guard seems a better unit to do it, but it's pretty expensive and above all is isn't part of the core tax. If you need to spend those 500 points anyway, using them on a line of halberdiers is a viable thing. But points prom specials are precious.
Anyway, we can do the same with knights. Take 20 knights for 460 + command iirc, drilled, lance and shield, start 10 wide and open to 15 on the charge (or counter-charge). They actually have a chance at charging successfully, more than infantry, at least.