Step 1. Go to the item bank
Click the menu icon on the top left of your screen and click Item Bank in the main menu.
Step 2. Create a top level group
Click the plus icon in the Groups index.
Step 3. Name the group
Enter a name for the group and click Save.
Step 4. Create a sub-group
Point to the group's 3-dot icon and choose Create to add a sub-group to the group you've created.
Step 5. Name the sub-group
Enter a name for the sub-group and click Save. Click the expand icon beside the top-level group in the index to see its sub-groups.