There you go:
Assuming there is only one transaction in a day....
With Tb1 as
(select Date,Particulars,BillAmount,0'PaidAmount' from tblBill
union
select Date,Particulars,0'BillAmount',PaidAmount from tblPayment
)
SELECT T1.Particulars,T1.[Date],T1.[BillAmount],T1.[PaidAmount],(Sum(T2.BillAmount) - Sum(T2.PaidAmount)) as Balance FROM Tb1 as T1
INNER JOIN
Tb1 as T2
ON T1.[date] >= T2.[date]
Group By T1.Particulars,T1.[Date],T1.[BillAmount],T1.[PaidAmount]
Order by [Date]
In case of more than one transactions in a day....
WITH Tb0 as
( SELECT [Date],Particulars,BillAmount,0'PaidAmount' from tblBill
UNION
SELECT [Date],Particulars,0'BillAmount',PaidAmount from tblPayment
)
, Tb1 as
(
SELECT Date,Particulars,BillAmount,PaidAmount,Row_Number() over (order by [Date] asc) as [OrderId]
FROM
Tb0
)
SELECT T1.Particulars,T1.[Date],T1.[BillAmount],T1.[PaidAmount],(Sum(T2.BillAmount) - Sum(T2.PaidAmount)) as Balance FROM Tb1 as T1
INNER JOIN
Tb1 as T2
ON T1.[OrderId] >= T2.[OrderId]
Group By T1.Particulars,T1.[Date],T1.[BillAmount],T1.[PaidAmount]
Order by [Date]