We have a construction company. I have set up Portals so trades can see some of the Deals information. I also have a custom modular for Sign-In dates and additional information.

I want them to see the Deals and see the dates they need  to be onsite.

I also want them to create new Sign-Ins and link them to a Deal reference (lookup).

However, when I invite a portal user, they cannot  see any of the Jobs or custom module data. I have tried setting to Create/Edit and Edit (Shared) but neither are working. They can only create new jobs. 

Is there a way a portal user can see existing jobs and modify certain sections only?