Most Efficient Way to Copy Values From Parent Object to Multi-Instance Child Object

Hi,

I’m looking for the most efficient way to copy values from a parent object to a multi-instance child object. For instance, if I need start and end dates from an order header on the order lines.

I should also add that I’d like to rename some of the attributes. I’ve been able to do this with the structure snap, but instead of creating a string, it creates an array.

Thanks,
Will