You can specify which document templates can be placed under particular document template in the content tree.
Add an Allowed Child Template
In the Development
section, unfold the parent application, unfold the document template and
then click Allowed Child Templates.
You can add an
allowed template by clicking the New
button in the menu.
The Add Child Template dialog appears. Enter part of the name of the template you want to add and click Search. Chose the template or multiple templates you want to add and click OK.
Remove an Allowed Child Template
You can remove an allowed child template by clicking the Delete button in the appropriate row and confirming the deletion.