Business Plan timeline modification in Excel

Hello, please see the attached Excel File. Its about a business plan. The time planning goes from January 2010 till December 2014. Your job is to update that plan, because now we need it from July 2010 till December 2014. So the numbers stay the same, but some calculations e. g. the sum for 2010 (not it s only 6 Months) will change. You can choose if you want to do it „by hand“. If you are able to do it by VBA, then I will pay a big premium – please indicate that option in the bid. In VBA I want a timescale where i can set from when to when the business plan should be valid. The numbers always stay the same. Please also post how many days you will need. Many thanks!