Pre-requisites:
Permission as mentioned below, on the project template in which a sub folder is to be created:
To manage the project template, 'Admin' permission assigned to you, your organization or a user group in which you are a member.
Below are the steps to create a sub folder in a project template:
1. In 'Files' area, from the folder tree available in the left side, navigate to the required project template.
2. Right click on the required folder under which sub folder needs to be created, and select 'New' then select 'Sub Folder'.
3. Follow the steps as required to create a sub folder on a project (See step 3 to step 10).
Next Article: Edit a Folder (in a Project Template)