IPrerequisitesComponent

      $projPath = "D:\MyJob\tests\builds\prerequisites.aip"

$advinst = new-object -comObject "AdvancedInstaller"
$proj    = $advinst.CreateProject($advinst.ProjectTypes.Architect)

# add chained package
$chained_prereq = $proj.PrerequisitesComponent.NewChainedPackage("$currentPath\resources\resources-powershell\Prerequisites\Feature-based Prereq1.msi")

# edit the chained package
$chained_prereq.Folder                 = "Test Folder Chain"
$chained_prereq.InstallUiLevel         = "Basic"
$chained_prereq.InstallProperties      = "TEST_PROP"
$chained_prereq.MaintenanceProperties  = "TEST_MAINT"
$chained_prereq.UninstallUiLevel       = "Silent"
$chained_prereq.UninstallProperties    = "TEST_UNINSTALL"
$chained_prereq.EnableLogging          = $true
$chained_prereq.RollbackProductsOnFail = $true

# add feature-based prereq
$feat_based_prereq = $proj.PrerequisitesComponent.NewUnchainedPackage("$currentPath\resources\resources-powershell\Prerequisites\Feature-based Prereq2.msi")

# edit the feature-based prereq
$feat_based_prereq.InstallCondition       = "Not Installed"
$feat_based_prereq.InstallCmdLineFullUi   = "/qn"
$feat_based_prereq.InstallCmdLineBasicUi  = "/qn TEST=`"basic install`""
$feat_based_prereq.InstallCmdLineSilentUi = "/qn TEST=`"silent install`""

$feat_based_prereq.AllowUninstall         = $true
$feat_based_prereq.UninstallCmdLine       = "/x {5FF4B3E3-CC54-4CCA-A2C4-8BC1E91B90A3}"
$feat_based_prereq.UninstallCondition     = "NOT TEST_UNINSTALL"

$feat_based_prereq.AllowMaintenance       = $true
$feat_based_prereq.MaintenanceCmdLine     = "/fomus {5FF4B3E3-CC54-4CCA-A2C4-8BC1E91B90A3}"
$feat_based_prereq.MaintenanceCondition   = "NOT TEST_MAINT"

$feat_based_prereq.AllowRollback          = $true
$feat_based_prereq.RollbackCmdLine        = "/rollback -test"
$feat_based_prereq.RollbackCondition      = "NOT TEST_ROLLBACK"

$feat_based_prereq.EnableLogging          = $true

# save the project
$proj.SaveAS($projPath)

#load the project
$projLoad = $advinst.LoadProject($projPath)

$chained_prereq_load    = $projload.PrerequisitesComponent.ChainedPackages | ? { $_.Name -eq "Feature-based Prereq1"}
$feat_based_prereq_load = $projLoad.PrerequisitesComponent.UnchainedPackages | ? {$_.Name -eq "Feature-based Prereq2"}