Although you can have only one workspace open at a time, you can add as many targets to the workspace as you want and open and edit objects in multiple targets.
Working with targets that share PBLs
If a target shares PBLs with another target in the same workspace,
as is the case when you create a .NET target based on an existing
application target, you should work on only one target at a time.
Objects are always opened in the context of a specific target. When
you open an object in a PBL that
is used in multiple targets, PowerBuilder needs to set global properties
for the specific target you are working on.
To add an existing target to a workspace:
Right-click on the workspace displayed in the System Tree and select Add Target from the pop-up menu.
The Add Target to Workspace dialog box displays.
Navigate to the directory containing the target you want to add and select the target (.pbt) file.
Click Open.
The target is added to your current workspace.
