Add or remove info to two lists in Sheet1 and Sheet2 and difference between two lists

Hi all,
Please solve my problem in the given excel file
1. Sheet1; how to Add "B000" in the List A or "B00" if the digits and 5 in the list
2. Sheet2; how to remove "B000" or "B00" from the list
3. Sheet3; how to highlight difference or find out the difference between to lists

Thanks in advance..