Is it possible to split a log / track for an activity?

In a rush to start my commute home last night, and forgot to “reset” – so I now have data for one 40k ride sinstead of two 20k rides…

Not the end of the world, etc, but is there a way to split the data to form two records? Couldn’t see anything obvious in the edit section.

Mainly use the online Garmin software, although do also store stuff in Training Centre as well.