Thank you for your post.
For some FileMaker Pro basics on Relationships, primary keys, foreign keys, etc., I would first read Knowledge Base Article #9922 at:
Performing a search on the web for: FileMaker Primary Foreign key
.... I found this link with a simple example:
After that, read Knowledge Base Article #5561 "Working with Portals":
This should get you pointed in the right direction.
Let me know if you need additional clarification.