Sitemap Problem

I submitted a sitemap to Google and most of the Urls are indexed. And now I want to submit another sitemap (updated one) but it does not accept. I have to delete the old one? Or just create another sitemap and submit? Please Help!!!

Thanks in advance!!

You can have 2 sitemap that's not a problem. But make sure you have quality one.

Make sure your second site map sitting on eg.,domainame.com/sitemap.xml and make sure your second sitemap don't have same name as first(/sitemap.xml)
Check your roborts.txt default is
User-agent: *
Allow: /
If your are using wordpress i recommend you to us[FONT=Arial, Helvetica, sans-serif]e "yoast" SEO plugin.

There is no point having two sitemaps. If your site is new or having only few pages better delete the old one and stick with new. [/FONT]

Just replace your first sitemap.