First date automatically update in spare part order item

Hello Guru,

my question is when team create sales order and will maintain the Req.delivery date for e.g 09/05/2022.

And then when we key in the material Info. each item First date will be filled in same with the same date of Req.delivery date(09/05/2022).

So i need to change the first date in sales order in new calculation logic is current order create date + each material PDT time.

con can we please suggest how we can do that.

Thanks

Kedar.