By the way, is there a way to arraywrite to predefined area of array?

arraywrite topline, ["mose"]

writes to 0 to 3 positions of array, but say I want to write this text from 4 to 7 positions, how should I?
I can add something like arraywrite topline, [1,2,3,4,"mose"], but this will delete previous content of previous array members, and I want to avoid this. Any way?