Scenario
 
 You have 2 lists of few common columns & few unique columns. In this case we may  choose not to use content types. 
 
 But content type is advisable in this scenario too.
  	- Add common columns to content type
- Add specific columns to list level
Solution
 
 The following would be the simplest solution in this case.
  	- Create a content type with common columns.
 
- Attach the content type to both lists.
 
- Remove the default content type of both lists.
 
- Add custom columns to each list at list level.
Steps
 
 Go to Site Settings, then Content Types
 ![Content Types]()
 Create a content type with the following columns:
  ![Create a content type]()
 
 Create a new list named Tax. Attach the content type to the list.
 ![create a new list]() 
  Add a new item with values for Title & PAN Number.  
![Add a new item with values]() 
  You can see the item displayed in the following screenshot:  
![Add a new item]() 
  Now go to the List Settings, then Add a new column named Age. Now use the edit form  to modify the previous item. You can see the Age column appears here.  
![item displayed]() 
  You can go to the List View settings to show the Age column in view mode too.  
![List View settings]()
 Create the second list, add the content type and create another column.  Here the same content type is reused for common columns & the custom columns are  managed at list level.  
Note
  Using content type for common scenario would save lot of time managing column  modifications, behavior etc.  
Summary
  In this article we have explored a real world scenario of content types.