bind datatable to datagridview & save records to other table

i have three tables 1. tblEmployee      (employeeID int,employeeName varchar(50))
                 table  2. tblSalaryMaster (salaryID int, salaryName varchar(25)
                 table  3. tblSalaryDetail   (employeeID int,salaryId int, salaryAmount int)
i made a form with employeeid name etc and bind table 2. (tblSalaryMaster) to dgSalaryDetail datagridview and add one column "Amount" to dgSalaryDetail Datagridview as

salaryID  salaryName  Amount
1            Basic           10000
2             HRA             4000
3              Ca              1000
now i want to save dgSalaryDetail's records to table no. 3 (tblSalaryDetail with employeeID
ie
employeeID  salaryID   Amount
1                      1      10000
1                      2        4000
1                      3        1000

Please help me how to do this.
Thanks in advance.