PowerShell for Excel: Sever external connections / remove queries / unlink external table data - excel

Question

I have a script which copies CSVs for each sheet in a formatted ("staging") workbook. The workbook is externally connected to a data source: a CSV export from our webform solution. Once this is completed, the script copies the staging workbook as well. But, in this new directory, the instance which is to display a specific form submission is still externally connected, so it's presently a pointless backup because it refreshes to the current form submissions export each time it opens.
TL;DR
How do I sever external connections / remove queries / unlink external table data in PowerShell?
Thanks in advance! And for the record, there are several business limitations so unless it's a mild adjustment to the current workflow, I won't be able to fulfill suggestions, i.e.- API, querying WP DB, Ansible, etc.
`
#set-executionpolicy -executionpolicy bypass
$Hosts = ".\ESXiHosts.csv"
$vCenter = ".\vCenter.csv"
$vSwitchPortGroups = ".\vSwitchPortGroups.csv"
$source = ".\source.csv"
$pivot = ".\pivot.csv"
If ((test-path $Hosts) -eq $true) {
Remove-Item $Hosts}
If ((test-path $vCenter) -eq $true) {
Remove-Item $vCenter}
If ((test-path $vSwitchPortGroups) -eq $true) {
Remove-Item $vSwitchPortGroups}
If ((test-path $vSwitchPortGroups) -eq $true) {
Remove-Item $source}
If ((test-path $vSwitchPortGroups) -eq $true) {
Remove-Item $pivot}
$staging = "formidableforms_staging"
$staging_file = $staging + ".xlsx"
$xlsxLoc = "\\blahblah\fs\groups\SysOps\Managed Infrastructure\Client Intake\Formidable Forms\"
$Excel = New-Object -ComObject Excel.Application
$Excel.Visible = $false
$Excel.DisplayAlerts = $false
$staging_wb = $Excel.Workbooks.Open($xlsxLoc+$staging_file)
$staging_wb.refreshall()
$connections = $staging_wb.Connections
while($connections | ForEach-Object {if($_.OLEDBConnection.Refreshing){$true}}){
Start-Sleep -Seconds 1
}
$staging_wb.Save()
$Excel.Quit()
Function ExportWSToCSV ($excelFileName, $csvLoc)
{
$excelFile = $excelFileName + ".xlsx"
$E = New-Object -ComObject Excel.Application
$E.Visible = $false
$E.DisplayAlerts = $false
$wb = $E.Workbooks.Open($csvLoc+$excelFile)
foreach ($ws in $wb.Worksheets)
{
$n = $ws.Name
$ws.SaveAs($csvLoc + $n + ".csv", 6)
}
$E.Quit()
}
ExportWSToCSV -excelFileName "formidableforms_staging" -csvLoc "\\blahblah\fs\groups\SysOps\Managed Infrastructure\Client Intake\Formidable Forms\"
stop-process -processname EXCEL
#Remove-Item -path "\\blahblah\fs\groups\SysOps\Managed Infrastructure\Client Intake\Formidable Forms\pivot.csv"
#Remove-Item -path "\\blahblah\fs\groups\SysOps\Managed Infrastructure\Client Intake\Formidable Forms\source.csv"
$CleanupHosts = Import-CSV $Hosts
$CleanupHosts | Where-Object {$_.ESXiHostDNSName -ne ''} | Export-CSV -path ".\ESXiHosts.csv" -NoTypeInformation -Force
$CleanupvCenter = Import-CSV $vCenter
$CleanupvCenter | Where-Object {$_.vCenterFQDN -ne ''} | Export-CSV -path ".\vCenter.csv" -NoTypeInformation -Force
$CleanupvSwitchPortGroups = Import-CSV $vSwitchPortGroups
$CleanupvSwitchPortGroups | Where-Object {$_.Type -ne ''} | Export-CSV -path ".\vSwitchPortGroups.csv" -NoTypeInformation -Force
$createdir = Import-CSV $vCenter
$custfolder = ($createdir).FOLDER
$FOLDERdate = (Get-Date -Format "MM-dd-yyyy_HHmm")
Try {new-item -path . -name $custfolder -itemtype "directory" -ErrorAction Stop}
Catch {write-host "The folder: $custfolder already exists."}
new-item -path $custfolder\ -name $FOLDERdate -itemtype "directory"
Copy-item *.CSV -Destination .\$custfolder\$FOLDERdate
Remove-item .\ESXiHosts.csv
Remove-item .\vCenter.csv
Remove-item .\vSwitchPortGroups.csv
Remove-item .\pivot.csv
Remove-item .\source.csv
Remove-item .\Hosts.csv
Remove-item .\Network.csv
Remove-item .\Storage.csv
Remove-item .\Other.csv
cd "\\blahblah\fs\groups\SysOps\Managed Infrastructure\Client Intake\Formidable Forms\"
Copy-item *.XLSX -Destination .\$custfolder\$FOLDERdate\$custfolder.xlsx
cd .\$custfolder\$FOLDERdate
Remove-item .\pivot.csv
cd "\\blahblah\fs\groups\SysOps\Managed Infrastructure\Client Intake\Formidable Forms\"
`
I cannot find documentation for any of the requested items, only adjusting the existing properties of the connection, or GUI how-tos.