AutoFill Destination - General Way To Specify Destination Range

I want to fill all a column bottom-up but without specify cells in format "A1500:A2" like

VB:
Range("H1578").Select
Selection.AutoFill Destination:=Range("H2:H1578")

{H1578 have a formula so...}

I have data in the first 7 columns, with a variable(Range) for the first 5 columns

VB:
Dim oRange As Range
Set oRange = ActiveSheet.Range(ActiveCell.Offset(0, 0), ActiveCell.Offset(89, 4))

{The first cell in it is A1}

My question is : How to fill Range("H2:H1578") using my ''oRange'' variable?

I try with OffSet but my code didn't work. I need to do the same with the 6 columns to the right and then plot in a chart.