Transpose to object but without values, yet - arrays

Question

I'm importing esxtop data from an ESXi host. The import gives me two sets of data. The first is the list of all the fields that I will be getting data from. The second is data in those fields.
The fields list is like this:
|SchedGroup|GroupID|GroupName|IsValid|IsVM|VMName|TimerPeriod|CPUAllocMin|CPUAllocMax|
I converted this into a Selected.System.String named $Headercols:
header
------
SchedGroup
GroupID
GroupName
IsValid
IsVM
VMName
TimerPeriod
CPUAllocMin
CPUAllocMax
But I actually need it to be in columns, instead of rows. Because later on I want to add "records" / "rows" containing the data. I tried using converting to columns using add-member, but that needs a name and a value, but I don't know the value yet.
The example here only has a few rows, but this grows to 33 rows, so I'd rather fill them in a loop instead of addressing each one specifically.
Later on I will be receiving the data like this:
|SchedGroup|13567824|vm.4430541|1|1|BJLDC002|10416|0|-1|
|SchedGroup|12883482|vm.4316334|1|1|VCDJAGTEST|15260|0|-1|
|SchedGroup|13558449|vm.4429332|1|1|BJLADF02|1000|0|-1|
(Example has 3 rows, each one VM, but it can be many more rows with VMs.)
I know how to split the rows into separate values, but just as with the headers, I wouldn't know how to expand the object.
All examples I google are immediately adding name and value, I can't seem to get my head around how I should work with that.

Answer 1

But I actually need it to be in columns, instead of rows.
You're getting ahead of yourself - "columns" and "rows" relate to how we might format (or display) the data - but right now we need to import and parse the data somehow.
I would suggest trimming the leading and trailing |'s, at which point we can treat the data set as a CSV (with | instead of , as the separator - a PSV?):
# Read header list and split into individual strings
$headerString = Get-Content .\path\to\headers.txt |Select -First 1
$headers = $headerString.Split('|', [StringSplitOptions]::RemoveEmptyEntries)
# Read data set, remove the leading and trailing pipes
$dataSetRaw = (Get-Content .\path\to\data.txt) -replace '^\||\|$'
# Convert to structured objects
$data = $dataSetRaw |ConvertFrom-Csv -Delimiter '|' -Header $headers
ConvertFrom-Csv will create one object per record, at which point you'll find most formatting cmdlets do exactly what you expect:
PS ~> $data |Format-Table
SchedGroup GroupID GroupName IsValid IsVM VMName TimerPeriod CPUAllocMin CPUAllocMax
---------- ------- --------- ------- ---- ------ ----------- ----------- -----------
SchedGroup 13567824 vm.4430541 1 1 BJLDC002 10416 0 -1
SchedGroup 12883482 vm.4316334 1 1 VCDJAGTEST 15260 0 -1
SchedGroup 13558449 vm.4429332 1 1 BJLADF02 1000 0 -1

Answer 2

Continuing from my comment...
'|SchedGroup|GroupID|GroupName|IsValid|IsVM|VMName|TimerPeriod|CPUAllocMin|CPUAllocMax|' -replace '\|', ',' -replace '^,|,\s*$'
# Results
<#
SchedGroup,GroupID,GroupName,IsValid,IsVM,VMName,TimerPeriod,CPUAllocMin,CPUAllocMax
#>
Yet, you say your data is coming in this way...
SchedGroup,13567824,vm.4430541,1,1,BJLDC002,10416
SchedGroup,12883482,vm.4316334,1,1,VCDJAGTEST,15260
SchedGroup,13558449,vm.4429332,1,1,BJLADF02,1000
...then just import it and assign headers.
$Headers = #('|SchedGroup|GroupID|GroupName|IsValid|IsVM|VMName|TimerPeriod|CPUAllocMin|CPUAllocMax|' -replace '\|', ',' -replace '^,|,\s*$')
Import-Csv -Path 'SomeFilePath' -Header $Headers