You can access the current workspace using the ActiveWorkspace global property, open, save, and close workspaces, and add folders and documents to it.
The following script constructs a simple folder structure in a workspace and adds and creates several models in it:
Option Explicit
' Close existing workspace and save it to Temp
Dim workspace, curentFolder
Set workspace = ActiveWorkspace
workspace.Load "%_EXAMPLES%\mywsp.sws"
Output "Saving current workspace to ""Example directory : "+EvaluateNamedPath("%_EXAMPLES%\temp.sws")
workspace.Save "%_EXAMPLES%\Temp.SWS"
workspace.Close
workspace.Name = "VBS WSP"
workspace.FileName = "VBSWSP.SWS"
workspace.Load "%_EXAMPLES%\Temp.SWS"
dim Item, subitem
for each Item in workspace.children
 If item.IsKindOf(PdWsp.cls_WorkspaceFolder) Then 
  ShowFolder (item)
  renameFolder item,"FolderToRename", "RenamedFolder" 
  deleteFolder item,"FolderToDelete"
  curentFolder = item
 ElsIf item.IsKindOf(PdWsp.cls_WorkspaceModel) Then  
 ElsIf item.IsKindOf(PdWsp.cls_WorkspaceFile) Then  
 End if  
next
 Dim subfolder
'insert folder in root
 Set subfolder = workspace.Children.CreateNew(PdWsp.cls_WorkspaceFolder)
 subfolder.name = "Newfolder(VBS)"
 'insert folder in root at pos 6
 Set subfolder = workspace.Children.CreateNewAt(5, PdWsp.cls_WorkspaceFolder)
 subfolder.name = "Newfolder(VBS)insertedAtPos5"'
 ' add a new folder in this folder
 Set subfolder = subfolder.Children.CreateNew(PdWsp.cls_WorkspaceFolder)
 subfolder.name = "NewSubFolder(VBS)"
 subfolder.AddDocument EvaluateNamedPath("%_EXAMPLES%\pdmrep.rtf")
 subfolder.AddDocument EvaluateNamedPath("%_EXAMPLES%\cdmrep.rtf")
 subfolder.AddDocument EvaluateNamedPath("%_EXAMPLES%\project.pdm")
 subfolder.AddDocument EvaluateNamedPath("%_EXAMPLES%\demo.oom")
 dim lastmodel
 set lastmodel = subfolder.AddDocument (EvaluateNamedPath("%_EXAMPLES%\Ordinateurs.fem"))
 lastmodel.open
 lastmodel.name = "Computers"
 lastmodel.close
 'detaching model from workspace
 lastmodel.delete
workspace.Save "%_EXAMPLES%\Final.SWS"
            For more information about properties and methods available on the workspace, select and navigate to Libraries/PdWSP/Workspace.