Move "Template Variables" to main "Create/Edit Document" tab in Revo.
Can I make it for the concrete parent?
Can I use this for the concrete type documents?
Create/Edit Document for parent 4?
This need for add specific content, and new form need only for this content.
Or for this needs, only make additional componets?
You should be able to do that with Form Customization. You can set a constraint so it only happens if the parent is 4.