Storing data like this in separate containers is an anti-pattern for a database like Cosmos DB.
Your design objective here should be to reduce the number of calls made to read or write data. Data should be stored in the way it is used. Data that is always or frequently used together should always be stored together. Ideally within the same document or as separate documents within the same container.
If you are new to using Cosmos DB I encourage you to look at the data modeling content I have put together in this gist, Cosmos DB Model and Partitioning Resources.