This is quite tricky if you fully direct formatted your document: in this case, there is no distinctions between paragraph and character layers, everything is direct formatting.
First make a copy of your document in case things go wrong, so that you can restart with an unmessed document.
When this security precaution is done, open the work copy.
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put the cursor at end of paragraph which will be the model for the built-in style and Enter
to create an empty paragraph
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style this empty paragraph with the target built-in style
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in the “model paragraph”, select a few characters representing your desired style and Format
>Clone Formatting
The cursor changes to a paint bucket.
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click in the empty paragraph you have styled with the built-in
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type at least one character so that you see and check the formatting
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select this character(s)
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Styles
>Update Selected Style
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erase the “fake” paragraph
You can now restyle all the paragraphs supposed to to be formatted with this built-in.
Do the same for all target styles.
CAUTION! Some words in your paragraphs may have a different formatting than the base paragraph formatting. This is normally handled with character styles. You can tell if word sequences are exceptions to base formatting after restyling by selecting the whole paragraph and Ctrl
+M
(Clear Direct Formatting). If something changes, you need character styles to centrally control intra-paragraph formatting (otherwise leave it as is with direct formatting). You undo this clear action with Ctrl
+Z
as usual.
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