Hello, You can use hash tables to get this done.
Get-NaVol | select name,Aggregate,used,@{Name="Available(GB)";Expression={[math]::Round([decimal]$_.Available/1gb,0)}},@{Name="SizeTotal(GB)";Expression={[math]::Round([decimal]$_.sizetotal/1gb,0)}} | ? { $_.used -gt 80 } | ft -AutoSize
PS C:\Users\Vinith> Get-NaVol | select name,Aggregate,used,@{Name="Available(GB)";Expression={[math]::Round([decimal]$_.
Available/1gb,0)}},@{Name="SizeTotal(GB)";Expression={[math]::Round([decimal]$_.sizetotal/1gb,0)}} | ? { $_.used -gt 80
} | ft -AutoSize