Step 1: Press ALT + K on Gateway of Tally
After This Go Back Gateway Of Tally Prime And Press "ALT + K" Key At A Time, After it Select Alter option and Tap On It.After Tap You Will See Like This Here You Need To Select Again Company Which You Want To Delete And Press Enter On That Company.
If You Want To Delete Company Then Press ALT + D Key, After This You Will See A New Popup Window For Confirmation Deletion Of Company Tap Here Yes.