What you need is to define a numbered list. Formatting a numbered list requires both a paragraph style and a list style (badly names because it describes only the counter and the left alignment).
A paragraph style semantically indicates the “value” of the text: running narrative (then Text Body style – not *Default Paragraph Style as is the rule under M$ Word because styles in Writer are organised hierarchically and inherit from ancestors; *Default Paragraph Style is used only to define your preferred defaults and should never be used to format text), comment, note, quotation, … See that names never describe the look of the contents.
In your case, you can use paragraph style Numbering 1 for your list. You’ll associate it with list style Numbering 123 in the Outline & List
tab of the style definition.
In Writer all list are multi-level. The list style controls up to 10 nested levels. You’ll have to customise Numbering 123 to fit your specification.
To access list styles, enable the style sidepane (if not already visible Styles
>Manage Styles
or F11 if you aren’t under MacOS where it is intercepted by the OS). Click on the 5 small icon in the pane toolbar.
Right-click on Numbering 123 and Modify
. You’ll play with Position
and Customise
tabs. DON’T USE THE OTHERS as they will reset all your customisation.
In Customise
, modify Show sublevels so that full numbering is shown on all levels. Do that on each level or select 1-10 and set the parameter to 10.
A list style takes over the left indent of the paragraph style. The Position
tab will allow you to indent your levels relative to each other. Since you seem to prefer to align your numbers with the indent of the paragraph above, this requires to change the default distances.
Your parameters of interest are Aligned at, Tab stop at and Indent at. Keep left Number alignment and Numbering followed by tab stop.
Aligned at defines the position where the number starts. Indent at is the distance for the left limit of the list item text. To have nice multi-line items, set tab stop and indent to the same value.
At level 1, Aligned at is equal to the Before text indent of the unnumbered paragraph above your list. This is usually 0 cm. Set the indent so that your widest number can be set inside this distance.
At level 2, set Aligned at equal to level 1 indent (more generally at level n, set alignment equal to level n-1 indent). Set indent so that your widest number can be laid out between align and indent without causing a spurious tab jump.
And so on for higher levels.
Note that since you display all level numbers, your numbers become wider and wider with level. So, the 1 cm space of level 1 is probably too small at higher levels.
When you want to type a list item, just apply the paragraph style, the associated list style automatically takes care of the number. To promote your list item at a higher level, press Tab at the very beginning of the item. To demote it press, Shift+Tab.
For an unnumbered item, press Bksp at the very first position of the item. This suppresses the number, keeping the indent.