To manage your existing data more wisely and collaboratively over the web, make use of the recently launched feature - 'Create application by Importing Data'.
You can import your data (of .xls .csv or .tsv formats) either by copy and paste or by importing the whole file. Know How
The great usefulness of this feature is that you can quickly import data from your existing project into a web application and start using it right away.
Come see your spreadsheets transforming into web application, beautifully.