How to make track changes in word according to our need?

We need to convert Microsoft Word Tracked Changes according to the following rules: For insertions of new words or phrases, the new words should be underlined. For insertions of characters (letter, numbers, symbols, etc.) into existing words, the old word should be deleted and the replacement word should be underlined. For deletions of entire phrases and/or words that are longer than 3x characters, the deleted word should be in strikethrough. For deletions of entire words that are 3x characters or shorter, the deleted word should be in double brackets. For deletions of letters into existing words, the old word should be deleted and the replacement word should be underlined. The old Tracked Changes should be rejected and there should be new Tracked Changes for the above revisions.