Like 10g, we do not have available option to create Complex Joins from Toolbar. Can only create “Foreign Key” Joins.
But we can create complex joins using Join Manager. (This option not available from tool bar)
Go to Manage > Joins > Actions > New > Complex Join.
Browser the physical tables on which you want to perform joins then create complex join.
As you might know complex joins will be used when we have to mention case when condition, or condition..etc in our join.