1. Choose a field.
2. Select object > generated code > copy on VisualForce page > create a visualforce page inline on the required object's page layouts
3. Follow the below steps to add a Visualforce page inline on page layouts.
- Go to Setup > Customize > Cases > Page Layouts.
- Customize the desired page layout
- Drag the empty section to the layout (select 1 column layout) and then drag (step 2 created) the visualforce page into this new section.
- Set the height of the section to the desired height, based on the number of fields selected for One Click Update.
- Click Save