CustomTypeNames.ps1

# Method 1 - Using PSTypeNames 
$Alpha = [PSCustomObject]@{a=1; b=2}
$Alpha.pstypenames.Clear()
$Alpha.pstypenames.Add('Alpha')
$Alpha | Get-Member

# Method 2 - Using PSObject Adapter
$Beta = Get-Service BITS
$Beta.PSObject.TypeNames.Insert(0,'Beta')
$Beta | Get-Member

# Method 3 - Using Hashtable
$Gamma = [pscustomobject]@{
    PSTypeName='Gamma'
    Name = 'Prateek'
    Age = 28
}
$Gamma | Get-Member