Change Negative Figures in NL Table - sign change for the amount

Sales figures usually in negative numbers due to credit balances, I wanted to get the same in positive figures or just opposite of it's original values i.e. positive if they are negative or negative if they are positive in the table, usually in NL sum or GL functions can simple add the sign in front of the formula , not sure how to get the sign changed for this amount field in NL Table, of course can get it adding the NP formula in Table also nut wanted to know if we can get the figures sign changed without putting one more column in the table by adding the formula, i.e. directly change the sign for amount column 

Please help 



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