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The Autosum.
In Excel there can be many hierarchies. Cells are in a worksheet, a worksheet is in a workbook. A grand total formula could be adding up the results formulas giving other totals. There can be hierarchy in graphics.
It is not XML, Excel is a spreadsheet software. But you could save your worksheet as XML format as well as other formats like XLS, CSV, and many more.
A Microsoft Excel 97 through Excel 2003 worksheet contains 65,536 rows. A Microsoft Excel 2007 workbook saved in one of the new formats (.xlsx, .xlsm) has worksheets with 1,048,576 rows.
Autoformat is one thing that allows you to build consistent formats. You can also do it manually.
Not sure what "sharing" or "worksheet" means. However, Open Office can save documents in any number of file formats such as the popular MS Office legacy formats for Word, Excel or PowerPoint. You can even exchange documents with Google Office (see related links for a video how to).
An Excel worksheet or spreadsheet allows data to be easily summed and charted.
Create a blank worksheet.
You can use the Format Painter or you can use copy and then Paste Special and choose to paste just the formats.
The worksheet.
Yes, a chart in Excel is created from data that has been selected in the worksheet.
An Excel spreadsheet is referred to as a worksheet. A collection of worksheets is called a workbook.