Help required to manipulate the data without exporting the output twice

Question

I am running a script which export the data to CSV file and I re-import the same file to remove the duplicate rows and them export them.
Need to clean the up the first file after the script execution
Is it possible to store the data in an object without export and import for manipulating the data
&{foreach($role in Get-VIRole){
    Get-VIPrivilege -Role $role -ErrorAction SilentlyContinue |
    Select @{N="Role";E={$role.Name}},@{N="Assigned Privileges";E={$_.ID}}
}} | Export-Csv C:\Scripts\Permission.CSV -NoTypeInformation -UseCulture 
&{foreach($row in (Import-Csv C:\Scripts\Permission.CSV -UseCulture)){   
        if($prevRole -and $row.Role -eq $prevRole){
            $role = ""
        Else{
            $role = $prevRole = $row.Role
        New-Object PSObject -Property @{
            Role = $role
           "Assigned privileges" = $row."Assigned Privileges"
    }} | Select "Role","Assigned Privileges" | Export-CSV

Answer 1

If I understand the question correctly, I think this might work.
$ht = @{}
foreach($role in Get-VIRole){
Get-VIPrivilege -Role $role -ErrorAction SilentlyContinue |
foreach { $ht[$role.name] = $_.ID }
$ht.GetEnumerator() |
foreach {
New-Object PSObject -Property @{Role=$_.name;'Assigned Privileges' = $_.value}
} | export-csv
That uses a hash table to de-dupe the role/assignment pairs and then builds the objects for export from the hash table.
[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "