Dora Derado Giljanović 

The obvious approach would have been to split the book up into chapters, or whatever split you wanted, before you started.  That should be simple enough with most types of DTP software.  Then you could have created a project with the separate chapters (lets call them chapters) as separate files and it would have been easy to do what you want.  What software was the book written in?

As we can't have different due dates for each file, which I agree would be useful, you could create separate projects with due dates for each chapter and manage the work that way.

If you've already started with one single file, and if you can't go back and split the source anyway then create a new set of projects, pretranslate to get to where you were etc.; then you could split the single file you have into multiple chapters using Studio Views.  The reviews could not be done in the original source format if you did this, but you could use the "Export for External Review" for each chapter and send out a bilingual Word file with two columns, the source on the left and the target on the right.

All things considered I'd favour splitting the source file up and creating separate projects to be able to manage them in the way you wish and all with Studio.

Dora Derado Giljanović 

The obvious approach would have been to split the book up into chapters, or whatever split you wanted, before you started.  That should be simple enough with most types of DTP software.  Then you could have created a project with the separate chapters (lets call them chapters) as separate files and it would have been easy to do what you want.  What software was the book written in?

As we can't have different due dates for each file, which I agree would be useful, you could create separate projects with due dates for each chapter and manage the work that way.

If you've already started with one single file, and if you can't go back and split the source anyway then create a new set of projects, pretranslate to get to where you were etc.; then you could split the single file you have into multiple chapters using Studio Views.  The reviews could not be done in the original source format if you did this, but you could use the "Export for External Review" for each chapter and send out a bilingual Word file with two columns, the source on the left and the target on the right.

All things considered I'd favour splitting the source file up and creating separate projects to be able to manage them in the way you wish and all with Studio.