Need help - Copying and pasting worksheets / formulas

I have created 2 worksheets for my business tax for 2012

1- sales log by month
2 - Cost of sale / P&L

There are formulas in place linking info from 1 to cells in 2

I want to create a set of the same worksheets for myself, which will show my actual tip amount (restaurant). My questions are:

Will the new worksheets' formulas point to doc 2 in original set or will they be separate, pointing to new copied doc?
If I wanted to do the same for 2010 & 2011 would they then point to original also?

Thanks
Confused idiot

......agh, I realized I can simplify this a little by merging the tabs from sheet 1 onto sheet 2. How do I do that without losing the formulas that link the 2 sheets? Is there a quick way? Or do I have to copy each tab and paste it separately (assuming formulas wont get lost)

Then above post applies for creating copies.

So sorry for the confusion. I appreciate anyone's benevolent help in advance.