I've managed to create a new Paragraph with style for sitecore rich editor by creating a new item under: /sitecore/system/Settings/Html Editor Profiles/Rich Text Default/Paragraphs/
The paragrah value is
Issue: For the first time when I select a section on RTE and click this new selection it successfully wraps with tag below:
<p class="something> paragrah...... </p>
However when I again select the same paragraph and select "Normal" style the above doesn't get replace with:
<p>paragraph..... </p>
If we reverse the above also doesn't work. Some reason RTE seems to think
<p class="something> is same as <p>`
Could someone help me whether this is a bug within RTE/Sitecore?