It is not possible to explain these topics on this platform with examples, i will have to write many paras to explain, it is advisable that you first see videos for the same, as i said earlier i cannot teach through it, i can clear doubts arising after watching videos.
Still trying to explain , wont be able to do it every time.
Previous Year Data = Comparatives
It can be given in 2 approaches
- If its given in adequate detail, just like current year —> Comparative FINANCIAL STATEMENT Approach (Previous Year Data is Like Separate Financial Statement)
- If its not in adequate detail —> Corresponding Figures Approach (Just like additional figures given in financial statements)
Further didnt understand last 2 lines of your question ?