I've been given a doc where the styles are not working as I would expect.

Heading 1 = 1. Heading
Heading 1 = 2.Heading
Heading 2 (I have had to modify to get numbers) = 1.1 Heading
Heading 2 = 1.2 Heading

I want the Heading 2, to pick up the numbering i.e. be 2.1, 2.2

Set numbering Value just update the decimal i.e 1.1 1.2 1.3

Continue Numbering changes the 1.1 to 3, setting it to be a Heading 1

Is there anyway to rest all Styles or re-import , or simply get heading 2 to pick up the numbering off heading 1

Thanks