I currently have 2 plank's running, but they show all of the workspaces current windows.
I need them to show only the current windows tasks.
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If you check your settings for plank, there is an option, under the Behaviors tab that specifies: Restrict to Workspace, This may help you in the right direction
If you Ctrl+Right-Click on the Plank you'd like to set this on, you'll find a "Restrict to Workspace" toggle that should handle this function for you.