Incorporating a new trainng plan into my existing one

I have a customized planned training plan. I want change it but not loose existing data  for the training done up to this point.

My plan is to do the following.

1. export the existing plan called V.1 which is an excel document I will call E-V.1.
2. create a new training plan V.2.
3. replace the V.1 with V.2.
4. export V.2 into the excel document E-V.2.
5. copy and paste the data for the dates for the old period from E-V.1 into E-V.2 and save it as E-V.3
6. import E-V.3 to replace V.2 to become V.3

Will this work.

Michael