How to add more of these yellow handles for the line tool in Visio?

How to add more of these textboxes that have handles that are attached to the line tool in Visio?

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Please see the picture, there is a yellow handle right in the middle.

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Just add a new line, then double click that line. That will add text to the line and that text field will have a yellow "handle" that you can move it about with.

If you want text boxes then add text boxes.

If you want your text boxes to move with other objects then group them.