Hello
You can try this.
Open the "I/O Configurator"
Go to Controller => Configuration => I/O Enginering Tool
In the left window navigate to I/O System and then Right Click on "PROFINET"
Go to Import => GSD File => Select the GSDML
Once imported navigate to "Controller" under "PROFINET"
Now look to the right window and go to "Device Catalogue"
The devices from the GSDML file should be there , double click to import.
Once done select "Write Config" in the top menu , this will make the device and update the XML file so no need to load anything.
I hope this helps you