Open: Workspace Designer > Content Part Designer > Query Editor.
From the Query Editor toolbar, select New.
A New Workspace Query is added to the Queries pane (on the right).
To save the new query click Save All. This saves changes to all queries, not just the one displayed.
The query is now saved but is not used in any workspaces at this point. This allows you to review your queries first.
Those queries that are saved but not yet used in workspaces are stored in the folder ...Sage\IM Content\Modifications\Queries\Pending.