You can use a custom Deal Guidance layout for deals on the Cart page. Custom pages are useful when you want to add custom-built content in layout for deals. To view the custom page, you need to provide the custom page URL in Config System Properties.

To enable custom deal guidance page

  1. Go to Setup > App Setup > Develop > Custom Settings > Config System Properties > Manage.
  2. Click Edit next to System Properties.
  3. Enter the Deal Guidance custom page URL in the Custom Deal Guidance Page field. For example, enter https://na34.visual.force.com/apex/MyCustomDealGuidancePage for a custom page named MyCustomDealGuidancePage. 

For a selected Quote/Proposal Line Item, you can 'Preview' the custom Deal guidance interface and activate the custom page if the preview is satisfactory.