I just got my first cta ever and I was wondering I remember hearing somewhere there is a certain order to do it to extend the duration or something along those lines? Is there a order? Please explain in detail if you can tysm !!

You cast lvl x battle command, then you cast it aagain since is going to be level x+1, now you cast battle order.

Ok got it, and doing that just basically extends the duration?

Well, 5 seconds because is what you get for an extra level in BC.