SQL Query to Sum based on more then 1 col

Hello there,

I have this query which returns me the qty of each product in each office with their dates.now in the returned result i have repeated products with the same date in the same branch. i want to sum those records. how can i do it. I am using MSSQL 2008

SELECT
    dbo.Branch.id,
    dbo.Branch.name,
    CONVERT(VARCHAR(10),dbo.Receipt.receiptDate,105) AS SaleDate,
    dbo.Tafsil.description,
    dbo.ProductBoughtSupplierDetail.quantity,
    dbo.Batch.batchNumber
FROM
    dbo.ProductBoughtSupplierDetail
INNER JOIN
    dbo.ProductBoughtSupplier
ON
    (
        dbo.ProductBoughtSupplierDetail.productBoughtSupplierId = dbo.ProductBoughtSupplier.id)
INNER JOIN
    dbo.Receipt
ON
    (
        dbo.ProductBoughtSupplier.warehouseReceiptId = dbo.Receipt.id)
INNER JOIN
    dbo.Branch
ON
    (
        dbo.Receipt.targetBranchId = dbo.Branch.id)
INNER JOIN
    dbo.Batch
ON
    (
        dbo.ProductBoughtSupplierDetail.batchId = dbo.Batch.id)
INNER JOIN
    dbo.Tafsil
ON
    (
        dbo.Batch.productId = dbo.Tafsil.id)
WHERE
    dbo.Receipt.receiptType = 5
AND dbo.ProductBoughtSupplier.invoiceReceiptId IS NULL ;

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