If you are wanting to show all deliverables, regardless of the project chosen, you could, but you'd probably be better to have the deliverables show for the selected project.
To show all deliverables (regardless of project selected), use a stored procedure something like this:
select FIELDLIST from Organisations
left join Projects on Organisations.Organisation_ID = Projects.Organisation_ID
left join Deliverables on Projects.Project_ID = Deliverables.Project_ID
where Organisations.Organisation_ID = @P_Organisation_ID
Where you pass the parameter @P_Organisation_ID the value of the selected Organisation.
To show deliverables for a selected project, do the same, but use a different where clause.
select FIELDLIST from Organisations
left join Projects on Organisations.Organisation_ID = Projects.Organisation_ID
left join Deliverables on Projects.Project_ID = Deliverables.Project_ID
where Projects.Project_ID = @P_Project_ID
Passing the selected Project as the parameter.
Hope this puts you on the right path.