When I checked Basic Knime Examples for REST Demo I found the Call local workflow node is missing from my node repository.
I tried to download the KNIME extensions under Workflow Control/Automation, but I did not found any such a node.
Is there any other site from where I can download it?
the Call Local Workflow node is part of the commercial paid extensions to KNIME (e.g. Personal Productivity Licence). You won't find it in the standard / free release.