I want to overrule the negative rule in substraction

[Elainefish]

I have given numbers that will be subtracted to each other
B column are sometimes has higher value than A column

A1 = 500
B1 = 1000

A1-b1 = -500
I want it to be +500
I want to overrule the negative rule in substraction

[zbor]

use

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[Elainefish]

use

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thanks. This solved my problem