Solution
Create Assembly Instance.vi is a shipping example that come with NI Industrial Communications for Ethernet/IP driver add-on.
After you install the above driver, open NI Example Finder dialog from LabVIEW's
Help >> Find Examples.. and look for
EtherNetIP Adapter.lvproj. It is located under
Hardware Input and Output >> NI-Industrial Communications >> EtherNetIP folder.
Open the project and you will find the Create Assembly Instance.vi in the project as shown below.