just to update, I have successful trasnfer my blog from (blog.icalvyn.com) to (iCalvyn.com)
if some one access (blog.icalvyn.com/hello) it will auto redirect to (icalvyn.com/hello)
now problem rise, in this domain, there are 2 wordpress and 2 db. If I delete the wordpress in (blog.icalvyn.com), the above situation does works... damm
now I have 2 blog at my domain, and duplicated content too, not sure google will take away my PR or not... I am worry
