How to split the merged references and its ID sequentially in structure content stage?

How to split the merged references and its ID sequentially in structure content stage?

Solution: 

Step 1: Place the cursor before the merged reference and click ‘Enter’. 

Step 2: Select the reference and go to ‘Edit’ menu. 

Step 3: Click ‘Move to previous option. 

By doing this, the reference part will move to the previous section.  

Step 4: Click ‘Move to nextto move the reference into the back matter. 

Step 5: Click Structure Reference option from Edit menu to update the ID sequentially.