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yu85.info
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How to create a field in an attribute inside a block with autmatic caluclation

Hi, I have a block with two attributes - "A" & "B". I want to create another one - "C". I want the value of "C" to be - "A-B"

(A minus B). I want to insert menually the values of "A" and "B" and get the result automaticly in "C".

Can you help me please. I could not find an anwer in the web.

Thank you very much