Hi Abid Khan,
Do you need to import just the content (database) or do you have themes and plugins you wish to import as well?
You can use the export & import tools inside of your WordPress dashboard (Tools > Export & Tools > Import) to export and import your WordPress content.
If you have themes you wish to bring over as well, you should be able to copy your wp-content folder from your first site and upload that to your second site (overwriting the 2nd site’s wp-content folder). You can then activate your desired theme from your WordPress dashboard.
These two articles from the Codex provide more insight as well:
https://codex.www.ads-software.com/Running_a_Development_Copy_of_WordPress
https://codex.www.ads-software.com/Moving_WordPress
Hope this helps!