To add existing sticky notes to your Index Cards/Substorms one at a time, simply drag and drop them onto the Index Card. 

To add multiple stickies to an Index Card/Substorm:

  1. Press and hold the Shift key, click on a sticky that you would like to select.
  2. Then select as many stickies as you like. 
  3. The selected sticky notes will have a blue outline.

   4.   Drag and drop the group of stickies on your Index Card.

   5.   All the selected stickies will disappear and will now be a part of the Index Card.

Also see: 

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