There are 2 main types of extracts available in jinkō: highlights (to select text) and rectangular selections (to select a figure). Users can associate any type of extract with another one (from a same reference) to provide more context to an initial extract (note that in such a case, the associated extracts are called in jinkō ‘highlights’). 

Create ‘Combined extract’: In the right side panel, click on the 3 dots and  ‘View details’ . You will see a part called ‘Add associated highlight’. Click on it to create highlights to be associated to the initial extract . You can add as many as you wish.