Break Excel File by column value - powershell

Question

I have an Excel data source file which contains some customer records.
Now I would like to break the large file into small batches.
I would like to break Excel file into four batches by the customer name column by not just evenly break it down.
I have a source file that have a column called "Customer Name", which I would like use as an indicator to break the source file. Currently I write a Power Shell script but I got stuck ,the current method I use is
Get the column value on the customer name column.
Unique the customer array on the customer name
Filter the excel by the customer name and break down into batches
Below is my script but I stuck on do not know how to filter the items by the company name array.
# Load the Microsoft Excel Com Object
$Excel = New-Object -ComObject Excel.Application
# Open the workbook
$Workbook = $Excel.Workbooks.Open("XXXXX.xlsx")
# Get the first worksheet
$Worksheet = $Workbook.Sheets.Item(1)
# Get the range of cells that contain the customer names
$Range = $Worksheet.Range("D1:D1000")
# Get the values of the cells and store them in a variable
$Values = $Range.Value2
# Sort the values and remove duplicates
$UniqueValues = ($Values | Sort-Object) | Select-Object -Unique
# Clear the original range of cells
$Range.Clear()
Write-Output $UniqueValues
$ArrayLength = $UniqueValues.Length
$numberofrecordperbatch=$UniqueValues.Length/4
Write-Output $numberofrecordperbatch
#--------Divided into 4 batches-------------
function DivideList {
param(
[object[]]$list,
[int]$chunkSize
)
$j=1
$batch= #()
for ($i = 0; $i -lt $list.Count; $i += $chunkSize) {
$j+=1
$batch =($list | select -Skip $i -First $chunkSize)
#$companynamearray|Export-Excel -Path "XXXX.xlsx"
Write-Output $i
Write-Output $j
Write-Output $chunkSize
}
}
DivideList -list $UniqueValues -chunkSize $numberofrecordperbatch| foreach { $_ -join ',' }
Write-Output "Start"
#---------Filter------------
# Get the first worksheet
# Get the range of cells that contain the customer names
$Range2 = $Worksheet.Range("A1:X1000")
# Get the values of the cells and store them in a variable
$Value2 = $Range2.Value2
Write-Output $Value2