libreofficecalc formula

[Michael Havens]

 (budget) (real) (bdgt remain) 600 600 0 700                    50 650

The above is how I have it now. I want to be able to enter an amount into
'real' and for the formula to subtract it from budget and to put the
remainder in 'bdgt remain'. Please, how do I do it?

-- 
:-)~MIKE~(-:
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