How to Add Sub-Items to a menu in Your WordPress Website
Watch the video for how to add sub-items to your menu. Below it are the written steps.
Hover over appearance
To add sub-items to your menu, first, go to the menu editing page by hovering over “appearance” on the side navigation bar and clicking “menus”.
Press select
Select an already created menu by choosing from the drop-down menu at the top of the page and pressing “Select”.
Create a sub item
To create a sub item, simply drag a tab underneath and to the right of whichever tab is going to be the “parent” or the broader category.
Save menu
Press the save menu.
Now you have subitem
Now when you go to your site, a sub-item appears when you hover over the parent page.