Hi there,
Not quit sure why you want to create templates in PHOTOSHOP
I don't think you can edit them in DREAMWEAVER.
Here is what the help file says.
You can save a template in PSD format for use with other Adobe products, such as Adobe Graphics Server (available only in English) and Adobe GoLive. For example, a GoLive user can place a PSD template in a page layout, bind its variables to a database using dynamic links, and then use Graphics Server to generate iterations of the artwork. Likewise, a developer working with Graphics Server can bind the variables in the PSD file directly to a database or another data source.
For more information on using PSD templates to create data-driven graphics, see Adobe GoLive Help and the Adobe Graphics Server Developer Guide.