Container
Go to: Inventory-Storage Facilities-Containers

Image: Containers
Click on the arrow before containers name to see items inside

Image: Items

Image: Item Details
Create New Container
Click ADD NEW CONTAINER button

Image: Add new Container
Enter New Containers name and details and click SAVE button

Image: Containers name and details
The new container is created

Image: New Container
Add SubcontainerSub Container
Select any container and selected container's details will shown on the right.
Find Add Sub Container section on the bottom.
Enter new container name and click ADD button.
New container will shown in navigation tree