How to do bulk upload of Project Management deliverables and its association under project plan page

Summary

How to do bulk upload of Project Management deliverables and its association under project plan page

Content

Hi,

We have a requirement that, for each and every project, Business wants to create and associated minimum of 10+ deliverables, and we are creating more than 50+ projects on each for like installations. 

The deliverables are not in the same order and some times customer requested specific deliverables on the project execution.

Now we want to do bulk uploading of project management deliverables to project and need to associate them and also assign them to the project team members.

Kindly let me know, if anyone has same kind of requirement? and how to achieve this requirement.