Batch editing is based fully on client-side and it is essentially different than other server-side modes:
I'm afraid this requirement is not supported with Batch editing. You can use InPlace edit mode instead, which resembles Batch editing:
You can also add AJAX to simulate behavior similar to client-side performance.
For cascading comboboxes editing implementation, you can also check the samples provided here:
I hope this will prove helpful.
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