Auto- Number based on Parent child relationship

I want to auot number based on the parent . i.e if I have a number items (Parents) I want these to be auto numbered but any item below them, indented to be for example 1.1, 1.2, 1.3 etc. on the first parent level of indent and the next similar 2.1, 2.2, etc. Any idea to automate this?


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