It is actually possible to put chains of orders into the game right now. The UI lies to you and the troops blatantly ignore/move opposite of the second arrow, so the commands don't work. But the game has the setup to do it, should it ever be a high enough patch priority to make sure the controls work. Here's an old picture showing what I mean:I've always wondered why battleplans were just a go mechanic. Arrows should be able to activate once another arrow/objective is considered complete. Tiles should be able to be marked as targets as well.
Now, after naval landing, did the troops actually follow the ensuing spearhead orders consistently? No. But it's clearly possible to give orders sequentially. One day it might even be functional.