TheSimsTree february UPDATE
This update includes enhancements to the dropdown menu feature in the Sim's card, as well as minor fixes to other functions:
We've added a dropdown menu for worlds with icons from The Sims 4! Choose the world where your Sim resides with just a couple of clicks.
Minor avatar update: clicking on the main avatar in the Sim's card or any avatar in the "Avatars" section will open a gallery to view all avatars in carousel format.
Tooltips are now available in the tree styling menu to help you understand what each option changes.
Avatars
Clicking on the main avatar in the Sim's card or any avatar in the "Avatars" section will open a gallery to view all avatars in an enlarged format and a carousel mode.

Location
To add a world from The Sims game to a character, go to the Sim's card in edit mode. Find the "Location" field.

When you click on the add line, you will see a dropdown list with various options from the game. For convenience, start typing the Location's name in the field. The options that match your search criteria will appear in the dropdown list.

You can add multiple Locations to each character.

If the location your character lives in is not in the dropdown list, you can create an Additional Field and enter the required information there.