Script like below:

# http://larsenconfigmgr.blogspot.com/2015/01/powershell-script-bulk-import-ssrs.html
<#
.SYNOPSIS
    Bulk import SSRS Reports from a folder and update the reports data source.
.DESCRIPTION
    This script takes all the RDL files in a folder and imports them into a SSRS and updates the reports data source to the Configmgr shared data source.
.NOTES
    File Name  : Upload Reports.ps1
    Version    : 1.03 ,05.jan-2015
    Author     : Thomas Larsen - thomas.larsen@tromsfylke.no
    Requires   : Version 3
.LINK
    Blog
      http://larsenconfigmgr.blogspot.com

.PARAMETER webServiceUrl
Base URL to the report server ,usualy the Configmgr Site server (no /Reports at the end, ex: http://localhost:8080)

.PARAMETER reportFolder
 Report Server folder where the reports are imported to, the script creates the folder if it's not there. (no / at the beginning, ex : folder1/folder2)

.PARAMETER SourceDirectory
The local folder where the .rdl files are located. (no / at the end)

.Example
& '.\Upload Reports.ps1' -webServiceUrl "http://Reportserver.domain.local" -reportFolder "Larsen Reports -SourceDirectory "c:\ReportsToUpload"

#>


Param(
  [Parameter(Mandatory=$True)]
   [string]$webServiceUrl,

   [Parameter(Mandatory=$True)]
   [string]$reportFolder,

   [Parameter(Mandatory=$True)]
   [string]$SourceDirectory
   )

#$webServiceUrl = "http://reportserver.domain.local"
#$reportFolder = "Larsen Reports"
#$SourceDirectory = "C:\ReportstoUpload"

$ErrorActionPreference = "Continue"
Write-Host "Thomas Larsen - Januar 2015 - http://larsenconfigmgr.blogspot.com" -ForegroundColor Cyan
Write-Host "This Script is provided AS-IS, no warrenty is provided" 
Write-host ""

#Connect to SSRS
Write-Host "Reportserver: $webServiceUrl" -ForegroundColor Magenta
Write-Host "Creating Proxy, connecting to : $webServiceUrl/ReportServer/ReportService2005.asmx?WSDL"
Write-Host ""
$ssrsProxy = New-WebServiceProxy -Uri $webServiceUrl'/ReportServer/ReportService2005.asmx?WSDL' -UseDefaultCredential
$reportPath = "/"


#######
#Get Configmgr shared datasource
$Items = $ssrsProxy.listchildren("/", $true) | where {$_.Type -eq "Datasource" }
foreach ($item in $items)
{
#Check to see if Datasource name patches Guid Pattern
if ($item.name -match '{([a-zA-Z0-9]{8})-([a-zA-Z0-9]{4})-([a-zA-Z0-9]{4})-([a-zA-Z0-9]{4})-([a-zA-Z0-9]{12})}' -and $item.path -like '/ConfigMgr*')
{
Write-Host "Datasource:" $item.Name -ForegroundColor Magenta  
Write-host "Type:" $item.Type 
Write-Host "Path:" $item.Path

#Save parameters for later use.
$DatasourceName = $item.Name
$DatasourcePath = $item.Path
}}


##########################################    
#Create Folder
        Write-host ""
        try
        {
            $ssrsProxy.CreateFolder($reportFolder, $reportPath, $null)
            Write-Host "Created new folder: $reportFolder"
        }
        catch [System.Web.Services.Protocols.SoapException]
        {
            if ($_.Exception.Detail.InnerText -match "[^rsItemAlreadyExists400]")
            {
                Write-Host "Folder: $reportFolder already exists."
            }
            else
            {
                $msg = "Error creating folder: $reportFolder. Msg: '{0}'" -f $_.Exception.Detail.InnerText
                Write-Error $msg
            }
        }


#############################
#For each RDL file in Folder

foreach($rdlfile in Get-ChildItem $SourceDirectory -Filter *.rdl)
{
Write-host ""


#ReportName
 $reportName = [System.IO.Path]::GetFileNameWithoutExtension($rdlFile);
 write-host $reportName -ForegroundColor Green 
 #Upload File
     try
    {
        #Get Report content in bytes
        Write-Host "Getting file content of : $rdlFile"
        $byteArray = gc $rdlFile.FullName -encoding byte
        $msg = "Total length: {0}" -f $byteArray.Length
        Write-Host $msg

        $reportFolder = $reportPath + $reportFolder
        Write-Host "Uploading to: $reportFolder"

        #Call Proxy to upload report
        $warnings = $ssrsProxy.CreateReport($reportName,$reportFolder,$force,$byteArray,$null) 
        if($warnings.Length -le 1) { Write-Host "Upload Success." -ForegroundColor Green }
        else { write-host $warnings | % { Write-Warning "Warning: $_" }}

    }
    catch [System.IO.IOException]
    {
        $msg = "Error while reading rdl file : '{0}', Message: '{1}'" -f $rdlFile, $_.Exception.Message
        Write-Error msg
    }
    catch [System.Web.Services.Protocols.SoapException]
 {
            if ($_.Exception.Detail.InnerText -match "[^rsItemAlreadyExists400]")
            {
                Write-Error "Report: $reportName already exists." 
            }
            else
            {
                $msg = "Error uploading report: $reportName. Msg: '{0}'" -f $_.Exception.Detail.InnerText
                Write-Error $msg
            }

 }



##Change Datasource
$rep = $ssrsProxy.GetItemDataSources($reportFolder+"/"+$reportName)
$rep | ForEach-Object {
$proxyNamespace = $_.GetType().Namespace
    $constDatasource = New-Object ("$proxyNamespace.DataSource")
    $constDatasource.Name = $DataSourceName
    $constDatasource.Item = New-Object ("$proxyNamespace.DataSourceReference")
    $constDatasource.Item.Reference = $DataSourcePath

$_.item = $constDatasource.Item
$ssrsProxy.SetItemDataSources($reportFolder+"/"+$reportName, $_)
Write-Host "Changing datasource `"$($_.Name)`" to $($_.Item.Reference)"
}

#Something in the foreach loop keeps adding forward slashes to the parameter evertime it runs. 
#Strips slashes from the parameter.  
$reportFolder = $reportFolder -replace "^/","" #only replace the first /
}

Write-host ""
Write-host "Finished" -ForegroundColor Magenta
Write-host ""

http://larsenconfigmgr.blogspot.com/2015/01/powershell-script-bulk-import-ssrs.html

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