What kind of bator do you have? It will help giving advice (cabinet type, hova-bator,
brinsea, etc...)
well, I did that at the first hatch in my life.
It was just from my idea, so I don't know if I did the right thing or not.
Here I go :
I had a hova-bator 1602N with auto turner.
I set 21 eggs (14 made it to lockdown) on 3/11 and 14 eggs on 3/13
On 3/29, I took egg turner out and removed the last two rows, so it gave the space to lockdown 14 bantam eggs.
A dozen egg cart was well fit into that space. So I put egg turner back inside the bator without two rows, and put an egg carton in that space. I turned on egg turner again, so it was turned until 3/31.
By the way, my bantam eggs were hatching early, 10 chicks came out on 3/30.
On 3/31, I took out the chicks and removed egg turner, and keep those unhatched bantam eggs in the bator (just in case they hatch late) along with other 14 eggs. During April 2-3, 10 chicks were hatched.
If you don't have an automatic egg turner, I don't know how to turn the later hatching eggs...