How do I create multi-line text objects?

In Motion, the text object's Layout Method should be set to "Paragraph":

Then resize the bottom of the text object so multiple lines will be visible:

When the text is replaced in AutoMotion, it will automatically wrap to the width of the paragraph text object. You can also force a new line by entering a backslash "\" character in the text field.

e.g. "First line here\and second line here" becomes

First line here
and second line here