Question : Finding the source of a variable used by a function

I suspect this is fairly simple, but I can't seem to find it anywhere.

 I am reading an existing spreadsheet and have come across some declared variable names in a function..

 Something like this (for example)..

 =IF(A3>10,price_per_unit, price_each)

Where do I find out what price_per_unit is mapped to?  (I assume it's mapped to a cell?)  

Can I get a list of these "variables" somewhere so I can reverse engineer the spreadsheet?

Thanks!!

Answer : Finding the source of a variable used by a function

These are range names.

On your excel sheet if you pull down the dropdown on the left of the formula bar you can see these range names. If you select one of them, excel will take you to the mapped cell.

To get a list of the range names and the associated cells goto to menu Insert-->Name-->Paste and then select the Paste List button to get all the names pasted in the excel.

hope this helps.