Writer to Update a Default Style to Match Text Selection

Okay, so this is a feature which I tried but I can't find in LibreOffice Writer. I want to update/modify a preset style based on the text which I select. I have tried the /Update to Match Selection/ under the style but this doesn't seem to work. Running LibreOffice 5.0. 3.2 x64 Windows 10 64bit.

An Example of situation which I was using it is this:
I am working on a file with multiple headings, but these headings are just Default Style with Bolded and a Different font. Now I want to modify this Default Style with Bold as a Heading, but the Heading Style changes the style, unless and until, I manually change it for the file, it won't help.

Any possibility of help or resolutions to this. Might make my life easier if the /Update to Match Selection /did what I expected it to do.

Ankush