Hi Mahavirsinh,
For the same long URL and account, Bitly will always return the same Bitlink. Depending on what you're doing you may not need to use a second URL. We track
referrers to every Bitlink, so if you are only trying to segment by source, that may be enough. If you need different links to go along with different content, we recommend appending tracking tags (e.g. for Google Analytics, you'd use the "utm_*" tags) to the long URL before shortening, which will generate unique Bitlinks.
Hope that helps!