Effects of template changes
When you edit a template, be aware you are changing all instances of objects that were previously created from the template.
The exceptions are workflow, metrics, and attachment folders. When you change the workflow or metrics template for an object template, or add or remove an attachment folder, your changes apply only to objects you create after the changes are made. Existing workflows are not changed, nor are the attachment folders nor metrics for any existing projects, programs or plans.
The exceptions are workflow, people, or an attachment. When you change the workflow template, add or remove roles, or add or remove an attachment, your changes apply only to objects you create after the changes are made. Existing workflows are not changed, nor are roles or attachments for any existing Lists, On-demand Campaigns, or Corporate Campaigns.