Page line in rectangle
There is a line drawn inside the rectangle. The position of the line can be adjusted with the handle.
When you change the height of the rectangle, the line keeps its position relative to the top edge of the rectangle.
Because this is one shape you have only one text area for the entire shape. You need to insert empty lines in the text to jump from the upper part of the rectangle to the lower part. Anchor the text to the top, so that extending the text will increase it downwards.
Text in header
Some text in the body area.