There are some groups that hold bifurcated concert tours, i.e. the group splits into two troupes that tour simultaneously. Usually only one tour name will be used. In the past I have added one master Series for the whole tour and two subseries encompassing the tour routes of each troupe; the main issue I've had with this was what to name those two subseries. In absence of official names for each individual sub-tour, I'd think that some name incorporating the main tour name and the troupe name would be the way to go.

Discourse discussion (with example): https://community.metabrainz.org/t/naming-guideline-for-bifurcated-concert-tours-style-663/126815