You need a join. For Example you have a student table, observation table and a curriculum table. Refer to this link for help with a join table. http://help.filemaker.com/app/answers/detail/a_id/9922/~/understanding-and-creating-many-to-many-relationships-in-filemaker-pro
Post by PhilmodJunk on relationships at the following link
But this isn't just a simple many to many relationship. You have a three way linkage between children, content area and observations.
Two options that you can play with:
Where you'd need to duplicate records in Observations to link a group of children to the same observations
To try to do this with repeating fields isn't likely to make this any easier to work with.