One user at a time : In the instance where there are a number of people required to work on a spreadsheet, they can only access it when no-one else is working on it.
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.
"Spreadsheets for Actors" comprises a wide variety of programmed spreadsheets especially created for professionals in the entertainment industry. Whether you are an actor, producer, editor or director, you will greatly benefit from the "Spreadsheets for Actors" package. The "Spreadsheets for Actors" package facilitates a series of processes, ranging from creating and managing budgets to keeping track of unpredictable income and expenses.
Most spreadsheet applications have built in formulas and functions that will do the math for you so you don't have to. You can keep a running balance of your accounts and you can have each category totaled as well. You can keep it as simple or make it as sophisticated as you please.