You can get the Employee Id by using this code
Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
MsgBox(DataGridView1.Rows(e.RowIndex).Cells(e.ColumnIndex).Value)
End Sub
After getting your empID you can get the data from database and add it to other Grid
Thanks