How to simplify if/else code if I have a common pattern

From how I understand it, I am not looking for an if statement, or an elseif statement. In a foreach statement, I am trying to check X, and do one thing, check Y, and do that too, check Z, and do something different for that too.

Here is my current code:

    #5 | Add-UserToGrp and adding each user in their OUs to their respective Groups
Function Add-UserToGrp
{
    $OUusers = Import-Csv -Path "C:\MyScripts\FinalProject\csv\createUsers.csv"

    foreach($OU in $OUusers)
    {
        $user   = $OU.OUName
        $oupath = $OU.OUPath

        if($oupath -eq "Sales_OU")
        {
            Add-ADGroupMember -Identity "CN=SalesGrp,CN=Users,DC=PT,DC=LOCAL" -Members "CN=$user,OU=SalesOU,DC=PT,DC=LOCAL"
        }
        if($oupath -eq "HR_OU")
        {
            Add-ADGroupMember -Identity "CN=HRGrp,CN=Users,DC=PT,DC=LOCAL" -Members "CN=$user,OU=HR_OU,DC=PT,DC=LOCAL"
        }
    }

Is there some magical statement that will do what I want? I saw something about foreach -parallel that maybe was what I wanted, but it has to be in a workflow and I don't think that's the right direction to go. I need to run like 10 of these if statements and execute code after all of them, within a foreach statement.

Please tell me if I did a poor job explaining or you need me to clarify anything. Thanks in advance for your assistance.

Solution

Assuming all possible values of your OUPath are in the same format, this will simplify your logic without the if/else structure. You had the basics right before, aside from the typo.

Function Add-UserToGrp
{
    $OUusers = Import-Csv -Path "C:\MyScripts\FinalProject\csv\createUsers.csv"

    foreach($OU in $OUusers)
    {
        $user   = $OU.OUName
        $oupath = $OU.OUPath

        # Get everything before OU in $path, with an optional _ between the first part and the OU.  HR_OU becomes HR.  SomethingElseOU becomes SomethingElse.
        $null = ($oupath -imatch "([^_]+)_?OU")
        $path = $matches[1]

        # this combines the $path part into a combined string with the Grp. HR becomes HRGrp.  Sales becomes SalesGrp.
        Add-ADGroupMember -Identity "CN=$($path)Grp,CN=Users,DC=PT,DC=LOCAL" -Members "CN=$user,OU=$oupath,DC=PT,DC=LOCAL"
    }