Some hens can be moved while broody, but some cannot. Some of them insist on sitting only where they chose to sit, and will pace back & forth and quit being broody if moved.
With the ones I have had, they could all be moved once they had chicks. Peeping chicks must be more important than eggs that just sit there, so the hen stays with the chicks instead of trying hard to go back to the old nest.
I have sometimes let a hen sit in the main nest, then put chicks under her after dark, then moved her and the chicks early the next morning. Each time I have tried this, the hen accepted both the chicks and the move. (I've done it with several different hens, but the total number is still small, so I cannot be sure it would work with every hen.)