How to create a subfolder on mac mail

To create a subfolder on Mac Mail, you can follow these steps:

1. Open Mac Mail and select the mailbox you want to create a subfolder in.
2. Click on the "File" menu and select "New Folder" (or use the keyboard shortcut Command + Shift + F).
3. In the "New Folder" window, enter a name for your subfolder in the "Name" field.
4. Click on the "Location" dropdown menu and select "Create in" > "Selected mailbox" (or use the keyboard shortcut Command + Shift + >).
5. Select the mailbox you want to create the subfolder in from the list.
6. Click "Create" to create the subfolder.

Alternatively, you can also create a subfolder by dragging and dropping a folder into another folder. To do this:

1. Open Mac Mail and select the mailbox you want to create a subfolder in.
2. Drag and drop a folder into the mailbox you want to create the subfolder in.
3. Release the mouse button when the folder is in the desired location.
4. A new subfolder will be created with the same name as the folder you dragged and dropped.

You can also create a subfolder by right-clicking (or control-clicking) on a folder and selecting "New Folder" from the context menu.

Note: If you are using macOS High Sierra or later, you may need to use the "New Folder" option in the "File" menu instead of the "New Folder" window.