Date update from header to item

Hello All,

I have following questions.

1) in CRM if Item Category doesn't have any Date profile assigned in Item category IMG, does it use header date profile to show the date types in sales Transactions or dates doesn't show up at all on item level.

2) if Date profile for header and item has same date type assigned eg.,, Requested Delivery date on Sales Transaction TA, if I change date on header does it flow to the same item date type? if not - how to achieve it?

and there are no date rules assigned to that date type, its a manual entry.

Thanks

Chandrashekar