Design Table with no of columns used for calculating the total

Hello,
I need to design a table/s for calculating the column values based on the operators provided. Like I have a table say
TableID, Col1 , Col2 ,Col3 ... Total Value
Total Value Column is calculating Col1 (operator value provided by the user) Col 2 (operator value provided by the user) Col3 etc
Although I m thinking to create another table which stores operator values, however not sure how to calculate the total.
like it can be COl 1 +Col2 -Col3 %Col4 etc.
Please help.

Can you show some data example+ desired result?
DECLARE @t TABLE(a INT,b INT,c INT);
INSERT @t VALUES(1,2,3),(9,8,7),(4,6,5);
SELECT *
, ( SELECT COUNT(val)
FROM (VALUES (a)
, (b)
, (c)
) AS value(val)
) AS CountVal
FROM @t;
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Design Table with no of columns used for calculating the total

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