You can use the multiselect method to mass-edit records, or mass-delete. Multiselect is available on the Flights and Query page and the Tables - Aircraft / Pilots page.
The logic is similar to using a typical spreadsheet application :
- click on the first record you want to edit, or delete
- hold-down the SHIFT key on your Windows keyboard / CMD key for macOS Users, and click on the last record (this highlights all records between both selected records)
- or, hold-down the CTRL key on your keyboard and click on any record (to pick certain records only)
- then, click on the Edit button below the grid to mass-edit all records
- or, the Delete button to mass-delete all selected records
For the Desktop App, go to the query module, select the flights you wish to modify (You can find more information on this module in the PilotLog User guide on page 103), then click "edit": 
This will allow you to perform many changes like transferring or setting specific times (For example from PIC to SIC) or recalculating night-time:
This is now possible in the Pilotlog Mobile app as well!
Go to your flights-list, click on the multi-select icon (1), select the flights you wish to bulk-edit (2) and click Mass-Edit (3) to proceed: 
The next screen shows you similar possibilities as in the PilotLog Desktop app:
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