[users] Calc problems

[Nebojsxa]

Can you help me with some problems that I don't know how to solve? Thing that I need help with are: 1.    Is it possible when I open one workbook with 2-3 sheets, to see 2 sheets, one beside other? 2.   How to format column so it can only one value be write once?     example:             I want to format in column A, cells from A1 to A10;             I have values from 1 - 10;              If I insert value 4 in cell A6, only cell A6 will have value 4. What I need is something like Autonumber in MS Access. 3.   How to create combo box like this When I change  values in combo box other value in ex. price column, quantity column are also changed.