List style replaced when copying a document

Libre Office 7.0.1.2

Let’s say I create a simple document with a custom style I have created. I link this style to a custom list style. I use the style successfully in the document and save the document. Why is it that when I make a copy of the document and view the style in the new document, the custom list style has been replaced by another list style? How do I understand this behavior and what can I do to STOP it.

When I used to use Microsoft Word, I employed very simple indented lists in virtually every document I created. I have never been able to get them to work consistently in LibreOffice.

Thanks.

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