Apply new style for existing paragraph

Question

How to apply new style for existing paragraph
I need to apply existing paragraph style "FEBL1" to bullet list (newstyle)

Answer 1

May be I am not clear with your question.
You want to apply any style to a paragraph, you can use grep function:
app.findGrepPreferences = app.changeGrepPreferences = null;        
app.findGrepPreferences.findWhat = ".+";
app.findGrepPreferences.appliedParagraphStyle = "FEBL1";   
app.changeGrepPreferences.appliedParagraphStyle = "bullet list";   
app.activeDocument.changeGrep();
app.findGrepPreferences = app.changeGrepPreferences = null; 
OR
You want to add bullet list in your existing style "FEBL1", try the below code:
var pstyles = app.activeDocument.paragraphStyles; 
for(var i=0;i<pstyles.length;i++) 
    if(pstyles[i].name == "FEBL1")
        pstyles[i].bulletsAndNumberingListType = ListType.BULLET_LIST;
Vandy