Syntax Description:
old_text argument is used to give the cell reference of which text should be replaced. We can also give the specific text instead of cell reference.
start_num argument is used to give the location of first character in old_text argument from which replace should start
num_char argument is used to give total number of characters are to be replaced in old_text argument
new_text argument is used to give the replaced value that you want to replace in old_text