I want to add my previous flights without logging them one at a time.
Yes, you can!
Smart Logbook supports importing flights from CSV, which is a text file with special formatting to arrange data into rows and columns (like a spreadsheet). In fact, the easiest way to create a .CSV file is to start with a spreadsheet, e.g. Excel. Each row of the sheet will represent one flight and different columns will contain various flight properties (aircraft, route, times, etc). Smart Logbook expects the flight data to be structured and formatted in a particular way, or else the import will fail. This help doc has all the details:
https://thesmartlogbook.com/import-csv.html
We recommend initially converting just a few of your flights to the Smart Logbook format. Then after that data is successfully imported, create another file with the rest of the flights and import it. Note that each time you successfully import a file, Smart Logbook shows a notification at the top of the flights list, which shows options to either accept or discard the import. This way, if you notice errors in the flights after importing them, you can roll the changes back, correct the import file, and try again.
It can be a little tricky to get the formatting just right, so if you encounter problems just send us your Excel (or .CSV) file and we can help!