I used Table1TBL as the named table and Field1, Field2, Field3 as the yes/no checks.
This would be the SQL to get the Sums...
SELECT Table1TBL.ExampleNo, Table1TBL.Field1, Table1TBL.Field3, Abs([field1]+[field2]+[field3]) AS [Sum]
FROM Table1TBL
WHERE (((Table1TBL.Field1)=Yes)) OR...