1) On the ‘Online Store’ page (Products > Online Store), select the purchase scenario for which you want to add an existing screen to (if you want to add a new screen you will need to create the screen first, refer to ‘How to: Auto-generate a Basic Screen Template’ or 'How to: Create Your Own Screen off Screen Templates')
2) The ‘Purchase Scenario <name>’ page opens
3) Click the Add Existing Screen button
4) The Screens table opens
5) From the list of screens, select the screens you want to add to this purchase scenario by ticking the check boxes
6) Click the Add Screen(s) button
7) You will receive a confirmation message that the selected screens have been successfully added.
8) To have these changes reflected on your Cloud Store. You can visit your Cloud Store to see the changes.