If you have a large list of tasks or events to insert into the org then using the data loader is the best option. Although it requires the use of multiple files and inputting the correct IDs in the csv.
Video Link: How to Format the 'Date' and 'Date Time' Data in a CSV File- • How to Format the 'Date' and 'Date Ti...
Video Link: How to Prepare Your CSV File Using Vlookup in Excel- • How to Prepare Your CSV File Using Vl...
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