Folders in Dashpivot Web are used to structure templates and records within a workspace. However, not all folder hierarchy options are supported.
Direct Answer
No, not at the moment. Dashpivot Web does not support nesting folders inside other folders. Currently, there are only 2 levels of folder available in Dashpivot: Project folders & Team folders.
Limitations or Alternatives
All folders must sit at the same level and cannot contain subfolders.
You can use clear folder naming conventions to indicate hierarchy or grouping instead.
You can also use the template tabs to help group your templates (e.g. Safety, Quality, Commercial, etc.), which can often remove the need to have these as individual folders too.