[libreoffice-users] title1 style used for selected words, not paragraph

Hi,
I want to set the outline level of the selected words same as title1
style, for example:

Abstract: LibreOffice is a wonderful office suit as free software. It
has been widely used. balabala....

As you can see above, "Abstract" is in the same paragraph as the
following sentences. I want to set "Abstract" as title1, not the whole
paragraph.
If I simply apply title1 style, then the paragraph is seen in the
table of contents, which is not what I want. I could not just select
"Abstract", and apply the title1 style too. It doesn't work, but it
works in MSoffice. So, what should I do ? Any suggestion is
appreciated.

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