How to sum rows from a query?

Question

SQL

I have a query
SELECT Sum(Types of Work to be Performed.Price)+Sum(Services.PriceServices)+Sum(Parts.Price*Repair.Quantity) AS Total Contract.ContractCode
FROM Services INNER JOIN (Parts INNER JOIN ((Contract INNER JOIN Repair ON Contract.ContractCode = Repair.ContractCode) INNER JOIN (Types of Works Performed INNER JOIN Works Performed ON Types of Works Performed.JobCode = Works Performed.WorkCode) ON Contract.ContractCode = Works Performed.ContractCode) ON Accessories.KitCode = Repair.KitCode) ON Services.ServicesCode = Works Conducted
GROUP BY Contract. Contract Code;
it turns out such a label

Is it possible to sum up all the rows from the Total column?