Can we customize outlook web URL from https://outlook.office365.com to https://webmail/abc.outlook365.com in exchange online?
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not possible since you dont own Microsoft's DNS or have access to the URLs
You could create a CNAME in your DNS however for your domain.
Thanks @AndyDavid , Can you share docs or any articles to make changes for CNAME in DNS if you have. that would be great help
I suppose this link may be helpful: Add a CNAME record(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
You may need to add a CNAME record, the host would be your domain (webmail.abc.outlook365.com), and point it to outlook.office365.com.
While the detail steps also varies from which DNS provider(Godaddy,namecheap,etc.) you are using.
Thanks @KaelYao-MSFT , appreciate your help.
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