You can use Delete From Array and delete the first 300 rows. The remaining rows will be returned to you.
I want to extract the last 301 rows from this Nx48 array. (So rows N-300 to N)
How can I do that?
Use Delete From Array and only wire the length for the row. Leave the Index unwired and it will default to deleting from the end of the array. So the Deleted Subset is actually what you want to keep.