How to update data in several models in a single Web Service?

There are 3 tables in my database. Table1 has a one-to-many relationship to Table2. Table2 has a one-to-many relationship to Table3. I would like to write a web service API that allows the user to add rows to all 3 tables at the same time. The problem with CakePHP is that it only allows a controller to access its own corresponding model's data. How can a controller access other models? What is the best practices for CakePHP for a single controller to access other models? For my case in particular, which table should I use? Will Table1 be a good start since it is the parent to the other tables?

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