cut to selection documentation

Text editor.md

@@ -6,4 +6,20 @@ CKEditor supports markdown-like editing experience. It recognizes syntax and aut
 
 [[gifs/autoformat.gif]]
 
-Complete documentation for this feature is available in [CKEditor documentation](https://ckeditor.com/docs/ckeditor5/latest/features/autoformat.html).
+Complete documentation for this feature is available in [CKEditor documentation](https://ckeditor.com/docs/ckeditor5/latest/features/autoformat.html).
+
+## Cut selection to sub-note
+
+One of the common situations in Trilium is when you're editing a document and it gets somewhat large so you start splitting it up into subnotes - the process is essentially like this:
+
+* select the desired piece of text and cut it into clipboard
+* create new subnote & give it name
+* paste the content from clipboard into subnote
+
+Trilium provides a way to automate this:
+
+[[gifs/cut-to-subnote.gif]]
+
+You can notice how heading "Formatting" is automatically detected and new subnote is named "Formatting".
+
+This functionality is bound to `CTRL-P` keyboard shortcut. If there's no selection and you press this shortcut, Trilium will create empty subnote. This also works with `CTRL-O` shortcut - the only difference is that new note is created next to the current instead of inside the current.