Copy/Pasting Looping from bottom of Column Upward

[basepopeball]

First time posting on MrExcel. Been using forums for years and this has taught me a bunch about VBA coding. I have a project where I'm trying to loop through column A starting from the last cell with contents in it. I would like for the vba to loop upward repeating that cell value until new value is seen and continue until the top of the workbook. However, I would like it to end at Row 5 rather than 1. The code I've found goes top/down, hoping to get code to start at bottom of list and loop its' way up until row 5. Range will vary but will be in the sphere of 20,000 to 30,000 lines.

Row Column A Results
5 A
6 A
7 A A
8 B
9 B B
10 C C
11 D
12 D
13 D
14 D
15 D D

<code class="vb keyword">Sub</code> <code class="vb plain">FillDown()</code>
<code class="vb keyword">Dim</code> <code class="vb plain">xRng </code><code class="vb keyword">As</code> <code class="vb plain">Range</code>
<code class="vb keyword">Dim</code> <code class="vb plain">xRows </code><code class="vb keyword">As</code> <code class="vb keyword">Long</code><code class="vb plain">, xCols </code><code class="vb keyword">As</code> <code class="vb keyword">Long</code>
<code class="vb keyword">Dim</code> <code class="vb plain">xRow </code><code class="vb keyword">As</code> <code class="vb keyword">Integer</code><code class="vb plain">, xCol </code><code class="vb keyword">As</code> <code class="vb keyword">Integer</code>
<code class="vb keyword">Set</code> <code class="vb plain">xRng = Selection</code>
<code class="vb plain">xCols = xRng.Columns.CountLarge</code>
<code class="vb plain">xRows = xRng.Rows.CountLarge</code>
<code class="vb keyword">For</code> <code class="vb plain">xCol = 1 </code><code class="vb keyword">To</code> <code class="vb plain">xCols</code>
<code class="vb spaces">  </code><code class="vb keyword">For</code> <code class="vb plain">xRow = 1 </code><code class="vb keyword">To</code> <code class="vb plain">xRows - 1</code>
<code class="vb spaces">    </code><code class="vb keyword">If</code> <code class="vb plain">xRng.Cells(xRow, xCol) <> </code><code class="vb string">""</code> <code class="vb keyword">Then</code>
<code class="vb spaces">      </code><code class="vb plain">xRng.Cells(xRow, xCol) = xRng.Cells(xRow, xCol).Value</code>
<code class="vb spaces">      </code><code class="vb keyword">If</code> <code class="vb plain">xRng.Cells(xRow + 1, xCol) = </code><code class="vb string">""</code> <code class="vb keyword">Then</code>
<code class="vb spaces">        </code><code class="vb plain">xRng.Cells(xRow + 1, xCol) = xRng.Cells(xRow, xCol).Value</code>
<code class="vb spaces">      </code><code class="vb keyword">End</code> <code class="vb keyword">If</code>
<code class="vb spaces">    </code><code class="vb keyword">End</code> <code class="vb keyword">If</code>
<code class="vb spaces">  </code><code class="vb keyword">Next</code> <code class="vb plain">xRow</code>
<code class="vb keyword">Next</code> <code class="vb plain">xCol</code>
<code class="vb keyword">End</code> <code class="vb keyword">Sub

</code>

 

[basepopeball]

Row	Column A	Result
5		A
6		A
7	A	A
8		B
9	B	B
10	C	C
11		D
12		D
13		D
14		D
15	D	D

<tbody>
</tbody>

Added actual table for reference

 

[Akuini]

Try this:

[FONT=lucida console][COLOR=Royalblue]Sub[/COLOR] a1088978b()
[I][COLOR=seagreen]'https://www.mrexcel.com/forum/excel-questions/1088978-copy-pasting-looping-bottom-column-upward.html[/COLOR][/I]

[COLOR=Royalblue]Dim[/COLOR] i [COLOR=Royalblue]As[/COLOR] [COLOR=Royalblue]Long[/COLOR]
[COLOR=Royalblue]Dim[/COLOR] va

va = Range([COLOR=brown]"A5"[/COLOR], Cells(Rows.count, [COLOR=brown]"A"[/COLOR]).[COLOR=Royalblue]End[/COLOR](xlUp))

    [COLOR=Royalblue]For[/COLOR] i = UBound(va, [COLOR=crimson]1[/COLOR]) - [COLOR=crimson]1[/COLOR] [COLOR=Royalblue]To[/COLOR] [COLOR=crimson]1[/COLOR] [COLOR=Royalblue]Step[/COLOR] -[COLOR=crimson]1[/COLOR]
        [COLOR=Royalblue]If[/COLOR] va(i, [COLOR=crimson]1[/COLOR]) = [COLOR=brown]""[/COLOR] [COLOR=Royalblue]Then[/COLOR] va(i, [COLOR=crimson]1[/COLOR]) = va(i + [COLOR=crimson]1[/COLOR], [COLOR=crimson]1[/COLOR])
    [COLOR=Royalblue]Next[/COLOR]

Range([COLOR=brown]"B5"[/COLOR]).Resize(UBound(va, [COLOR=crimson]1[/COLOR]), [COLOR=crimson]1[/COLOR]) = va
[COLOR=Royalblue]End[/COLOR] [COLOR=Royalblue]Sub[/COLOR]
[/FONT]

 

[basepopeball]

Your amazing this works perfectly. Thank you so much for this. Saved immense amount of pain and struggle.

 

[Akuini]

You're welcome, glad to help, & thanks for the feedback.