i think that someone also have same problem. I didn't managed to solve this one, so i will explain.
What is goal? Getting amount how much is rest for spending for specific day (that day is probably today). So i have budget for one month lets say, 1000$, my daily spending is 32.25$. If i spent 20$ today, is there a possibility to see how much is left for today?
So basicly we have 3 steps.
1. SUM all transactions from today's date
2. Subtract from daily budget(i can put it in separate cell, or i can put it in same cell)
3. Show in cell