Depending on the type of your Sheet, you will have access to different features.
Some of these feature are common to all the sheet type, see Common features
The other ones are specific to a sheet type, see Components Sheet Features and Model Sheet Features.
If you're not sure what sheet type to use, the Components one is considered as the default one, it has most of the features in btibExcel. The Model Sheet is mostly used to work on your Nodes.