1. Create a Visualforce page that uses the GETRECORDIDS function to retrieve a list of selectedrecords:Note Replace www.yourwebsitehere.com with your own URL.
2. Define a button for accounts with the following attributes.Display Type─List ButtonNote Select Display Checkboxes (for Multi-Record Selection) so users can select multiple records in the list before clicking the button.Behavior─Display in existing window with sidebarContent Source─Visualforce PageSelect the Visualforce page you created in the first step.
3. Display Type─List ButtonNote Select Display Checkboxes (for Multi-Record Selection) so users can select multiple records in the list before clicking the button.
4. Behavior─Display in existing window with sidebar
5. Content Source─Visualforce Page
6. Select the Visualforce page you created in the first step.
7. Add the button to the appropriate page layout or list view layout.