How to bulk duplicate cells?

Question

excel

There is a table in which you need to duplicate the numbers of transport orders and the name of the carrier with the following structure:

There is a lot of data because it makes no sense to use hands.

Answer 1

D2 is set equal to A2.
D3:
=IF there is a value in A3
THEN take A3
ELSE take D2.
Well, lots of checks.
Further themselves.