I would like to change the Company name , kindly let me know if i change the company name my old datas will go or still present. Thanks

It's nice to see you here, sham2k.

I'll be happy to help share some additional steps to change your company details.  

If you change the company name of QuickBooks Online, only the company name will be changed and all of its data and other information will remain. 

To change your company name:

1. Log in to https://qbo.intuit.com/.
2. Click the Gear icon at the upper-right, click Accounts and settings.
3. From the left menu, click Company.
4. Click the Company name section, change the Company name and click Save.

You'll want to log out and log back in to refresh the system and further check the updates. For more details, you can use this link for more details in changing your business name, contact info, or EIN in QuickBooks Online. 

I'll keep an eye on your response.  Please come back and keep us posted on your progress in changing your company. It's my priority to get this resolved.