insert an item in a list with firebase

I'm developing a project with angular 4 and firebase. my problem is this. I have a travel list I want to create a trip (trip1 and insert a schedule in it. until then I made a firebasedb.list('Viagens/cronograma') now I wanted to know how to create another trip with another timeline without it falling back into the same list ex: viagens2/cronograma2 . haha have any tips on how to do this? Thank you.