The link below will install a series of Groups to help you track the following:
Part 135 Total Time.
Part 135 Actual Instrument.
Part 135 Night.
Part 135 PIC.
Part 135 SIC.
Note: to mark a flight as "Operated under 135", simply use the checkbox labelled "Part 135", and LogTen will do the rest! If the "Part 135" checkbox is not visible, please visit this article to make it visible → Configuring your Logbook
Download the Group by clicking/tapping here.