How to apply the same formatting style for the all paragraphs in LibreOffice Writer?

How to apply the same formatting style for the all paragraphs in LibreOffice Writer? (for.docx document). The same Line Spacing and spacing between paragraphs, and for paragraphs numbering, like this:

    5.1
     5.2.1
     5.2.2
   6.
    6.1 ...