Easiest way is to use the Copy Method of a PsObject
==> $o2 = $o1.PsObject.Copy()
$o1 = New-Object -TypeName PsObject -Property @{
Fld1 = 'Fld1';
Fld2 = 'Fld2';
Fld3 = 'Fld3'}
$o2 = $o1.PsObject.Copy()
$o2 | Add-Member -MemberType NoteProperty -Name Fld4 -Value 'Fld4'
$o2.Fld1 = 'Changed_Fld'
$o1 | Format-List
$o2 | Format-List
Output:
Fld3 : Fld3
Fld2 : Fld2
Fld1 : Fld1
Fld3 : Fld3
Fld2 : Fld2
Fld1 : Changed_Fld
Fld4 : Fld4
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