Connect to various data types (CSV, JSON, OPJ, OPJU, Matlab, Excel, HTML Table, XML, etc.) from web or on hard-drive. 

One workbook can only connect to one type of data. Different sheet can connect to different file of that type

Icon is added to upper-left corner with context menu to change Data Source, select different node to import, exclude data when saving, reimport (Alt+4), etc.

Exclude imported data when saving project to make project file size smaller.