Adding a bunch of data sources to vRealize Network Insight can be tedious, especially when the number of data sources goes into the 100s. This is one of the reasons why PowervRNI exists, and it's been helping organizations to add their entire network infrastructure to Network Insight in 1 go.
There's an example script in the PowervRNI GitHub repository called datasource-bulk-import.ps1, that allows you to add data sources of all types in bulk. To make getting started a little easier, I've recorded a video that focuses on adding 100 Cisco Nexus 5K switches to Network Insight in roughly 20 minutes.
The only prereqs are to have PowerShell version 6+ installed, have the switch information ready, and have Network Insight up & running.
Please let me know by commenting on the video if you have any questions!