Suggestion needed for Template (Budget Vs Actual)

Hi, our company always have those Upgrading project. They have set aside a certain amount for each project. Example, $3000 for Chairs. Whenever we received invoices pertaining to this budgeted $3000. We have to put it in excel so that we know how much is left in this $3000. However, most of the time, a single $3000 budget is make up of many invoices. This make presentation very ugly and We need constantly update formula and inserting row etc. See attached file and you know what i roughly mean.

Does anyone have any better idea how to keep track?

Based on Ali's recommendation, see the attached:

Totals are based on this type of formula ..

=SUMIFS(Expense!$C:$C,Expense!$B:$B,Summary!$E3,Expense!$F:$F,Summary!$C3)


You may want to consider "Estimates" (from Suppliers) vs Actual invoice amounts (I consider "Estimates" different from Budget). If Supplier contracts are not fixed price, then it likely the Actual will not match the estimate.