Autofill Dynamic Column - excel

Question

Trying to Autofill Column X and Column Y with text
Where Column Z determines the table length
Starting cell for column Z is "Z3" but column "X and Y" are dynamic
Last filled cell in column "X & Y" carries the text required.
Current Last cells is "X56" and "Y56"
Current last cell in column Z is "Z89"
I can easily get to x56 or y56 using
Range("Y3").Select
Selection.End(xlDown).Select
Selection.AutoFill Destination:=Range("Y56:Y89")
Range("Y56:Y89").Select
Range("X56").Select
Selection.AutoFill Destination:=Range("X56:X89")
Range("X56:X89").Select
However the solution eludes me to remove absolute references due to the dynamic nature of the information being imported and added to the column of previous information.
I tried this code i read through my research but couldn't make it work
lastRow = Range("Y3").End(xlDown).Row
Selection.AutoFill Destination:=Range("Y3:Y" & lastRow), Type:=xlFillDefault
Any assistance would be really appreciated as this appears to be the lynch pin to completing this task
Cheers
Mick
with I am trying to stack reports generated on a 12 hourly basis.
into an accrued 24 data table. This will then be accrued into a monthly data table.
As base information is downloaded in csv format. The four reports are formatted differently so i also have to stack the four reports in two table separated and itemised by date and shift.
This then allows the use of lookups, countifs sumifs etc to populate my outputs.
The four reports are dynamic and open to the potential of having a number of blank cells throughout.
I have written code that is robust enough to achieve this short of this one issue.
As the four reports do not have time stamps i am forced to use file names (column A:A) to populate the Date and Shift ranges (column A:B) as well as (Column X:Y) but need to drag the text down to cover all rows of information
Range("Y3").Select
Selection.End(xlDown).Select
Selection.AutoFill Destination:=Range("Y56:Y89")
Range("Y56:Y89").Select
Range("X56").Select
Selection.AutoFill Destination:=Range("X56:X89")
Range("X56:X89").Select
Autofill Columns with text without absolute references to allow for dynamic column range and without known starting point on the column

Answer 1

Do not use xlDown to find the last row. You may want to have a look at this Finding Last Row
Is this what you are trying? I have given you two option. Take your pick.
Option Explicit
Sub SampleA()
Dim ws As Worksheet
Dim lRow As Long
'~~> Change this to the relevant sheet
Set ws = Sheet1
With ws
'~~> Get last row in Col Z
lRow = .Range("Z" & .Rows.Count).End(xlUp).Row
'~~> Autofill formula in 1 go
.Range("X3:X" & lRow).Formula = .Range("X3").Formula
.Range("Y3:Y" & lRow).Formula = .Range("Y3").Formula
End With
End Sub
Sub SampleB()
Dim ws As Worksheet
Dim lRow As Long
Dim rng As Range
'~~> Change this to the relevant sheet
Set ws = Sheet1
With ws
'~~> Get last row in Col Z
lRow = .Range("Z" & .Rows.Count).End(xlUp).Row
Set rng = .Range("X3:Y3")
rng.AutoFill Destination:=.Range("X3:Y" & lRow)
End With
End Sub