As stated above, if I have a website at www.abc.com and already have a sitemap, then I want to make a blog at blog.abc.com . Do I have to make another sitemap ?Can I submit 2 sitemap in 1 domain?
Q1. Do I have to make another sitemap ? A. Yes, you require another sitemqap for a sub-domain. Q2. Can I submit 2 sitemap in 1 domain? A. Yes, you can. Following Google's guidline, if the site map is larger than 100 or so links, you may want to break the site map into separate pages.