Side Heads is an Adobe InDesign pluginm, will help you easily create text which is attached to the main text, but is defined with its own position. The position of the side heads may or may not be within the bounds of the text frame of the main story.
This plug-in uses anchored frames, which is a standard feature of InDesign CS2 and higher.

1. Side heads can be returned to the text flow.
While the use of anchored frames removes the text from the text flow, the text can easily be returned to the text flow for exporting of the text.

2. Side Heads can be defined by paragraph style or character style. They can even be created from footnotes.
If the side heads are created from footnotes, you have the option of preserving the footnote numbering as side notes.

3. Side heads don't need to be "side heads" at all!
If you use a bit of creativity, Side Heads opens up some very interesting layout possibilities.

Requirements:
* Adobe InDesign

The license of this software is Free Trial Software, the price is $59.00, you can free download and get a free trial.