On Vendor bill line, if we enter the amount, different from Qty*rate , it shows the warning. "The line total amount is not equal to the item price times the quantity. Is this correct?" Is there anyway to bypass that warning ?

open up Vendor bill form go to tab> sublist fields > select/click the amount field and move it above Gross amount field > save. Should solve the issue

Awesome, that solved the issue. Thank you very much @Sam-I-Am

You're welcome