We sometimes see a situation where both junior carnival and a senior carnival are being run at the same venue at the same time.
With both carnivals set up in SportsTrak, use the Actually its Two option and identify the two carnivals

Twin Carnivals
All the rest is the same as before except:
Event Numbers from Carnival A have an A appended to the number, and the second carnival has B added.

The SCH file showing some of Carnival A events. Carnival B are in the list below
The file above tells LYNX which events go with which carnival and it produces LIF files with that same notation below

The event numbers have A or B appended