Size limitation : When a spreadsheet is first constructed and tested, the size tends to be small. However, as the spreadsheet grows with more and more data, it start slowing down, until it reaches that point where your feet go to sleep while you waiting for the re-calculation to finish.
You'll need to include more than a basic level of development and calculation in your spreadsheet. There are lots of free spreadsheets on the web. Most of which are very simple and easy to build. People aren't going to buy a spreadsheet that they can get for free. Take yours to the next level by adding all the value you can imagine. Then research on how you can offer a little bit more on the development and functionality side.
By requesting the services of such specialist spreadsheet-solution-providing companies, business owners can rest assured that their needs will be met with precision, dedication and professionalism. Such companies are empowered by experienced teams of Mathematicians and Microsoft Excel Spreadsheet Designer/Programmers whose goal is to surpass the requirements and desires of their clients.
You may also want to track your current spending on one sheet with columns for different categories. Some individuals will list the budgeted amount in one column and then list the actual amount spent in the column next to it.
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