https://books.libreoffice.org/en/WG72/WG7216-MasterDocuments.html#toc7
cit.
Styles in master documents and subdocuments
[…]
The relationship between styles in a master document and its subdocuments is as follows:
- Custom styles used in subdocuments, such as paragraph styles, are automatically imported into the master document.
- If more than one subdocument uses a custom style with the same name (for example, myBodyText), then only the one in the first subdocument to be linked is imported into the master document.
- If a style with the same name exists in the master document and in the subdocuments (for example, Default Style), then the style is applied as defined in the master document.
- The styles in the subdocuments are only changed in the master document, so when a subdocument is opened for editing the original styles are not affected.
– end of citation
Master-subdocuments styles override rules as above don’t handle Writer stock/predefined styles modified by user, modifications template-level. What Writer behavior to expect at this point?
Term understanding: custom style are those styles created by user. Predefined but modified by user styles are no custom styles.
cit. “Writer offers these mechanisms to modify both predefined and custom (user-created) styles:”, source Chapter 8 Introduction to Styles