Convert text File to CSV Format using powershell

I want to convert the Text File to CSV File and below is the Format using Powershell and need some assistance

• Text File Structure: This is how the data looks in output or text file

Content for reference:

Quantity: 30
Manufacturer: Microsoft
License metric: Microsoft Core Infrastructure Server Suite Datacenter Core
Expiry: 31/12/2024

Quantity: 70
Manufacturer: Microsoft
License metric: Microsoft Windows Server Datacenter Core (SA)
Expiry: 31/12/2025

Quantity: 58
Manufacturer: Microsoft
License metric: Microsoft Core Infrastructure Server Suite Datacenter Core
Expiry: 31/12/2024

Convert Text File to CSV (into rows and columns) CSV Header: Quantity, Manufacturer, License metric, Expiry

Note:

• If preserving the input order of properties isn't important, a simpler,
  ConvertFrom-StringData-based solution is possible, as shown in Doug Maurer's answer.

• GitHub issue #19070 is a feature request to make ConvertFrom-Json emit ordered hashtables instead, which then would preserve the input order.

I suggest processing your file via the regex-based -split operator:

# Create an ordered helper hashtable to help with [pscustomobject] construction
$oht = [ordered] @{} 

# Split the input file into blocks of lines, and process each block.
(Get-Content -Raw file.txt) -split '\r?\n\r?\n' -ne '' | ForEach-Object { 
  $oht.Clear() # Clear the helper hashtable to start constructing a new object.
  # Split the block at hand into individual lines and process each.
  $_ -split '\r?\n' -ne '' | ForEach-Object {
    # Split the line at hand into property name and value...
    $name, $value = $_ -split ':', 2
    # ... and add this property-name pair to the helper hashtable.
    $oht[$name] = $value.Trim()
  }
  # Construct a [pscustomobject] from the helper hashtable and output it.
  [pscustomobject] $oht
}  # | Export-Csv ...  # Add your Export-Csv call here.

Display output, showing the constructed objects and their properties, using implicit table formatting:

Quantity Manufacturer License metric                                             Expiry
-------- ------------ --------------                                             ------
30       Microsoft    Microsoft Core Infrastructure Server Suite Datacenter Core 31/12/2024
70       Microsoft    Microsoft Windows Server Datacenter Core (SA)              31/12/2025
58       Microsoft    Microsoft Core Infrastructure Server Suite Datacenter Core 31/12/2024

Note:

• This solution works with any similarly formatted text file (where each contiguous block of lines represents an object, and property names and values are separated by :, and are unquoted), irrespective of the specific property names.

• Due to using regex \r?\n to match newlines (line breaks), both Windows-format files with CRLF newlines and Unix-format files with LF-only newlines are supported.

• For each block of lines, an ordered hashtable ([ordered] @{}) is used to collect that block's property-value pairs.

• Casting this hashtable to [pscustomobject] creates an instance of the latter, suitable for piping to Export-Csv.