1. System > Edit Nodes
2. Above the Table, Click on the last Icon that's black with an up arrow
3. Click Download to download the template
4. Edit the file in Excel 
5. Make the following changes:
   1. Change the Community field to be wmiusername
   2. Add a Column right beside wmiusername
      1. Add in your WMI Username for the nodes
   3. Change the heading to be wmipassword
      1. Add in your WMI Password for the nodes

Original Downloaded Template

WMI Template

Bulk Importing  Nodes with Admin GUI

https://community.opmantek.com/display/opCommon/Importing+Nodes+with+Admin+GUI