How to set up pre-filled shipping address options on a pop-up shop?

[corporateshop]

Hello - We are creating a pop-up shop for a corporate client. They would like their users to be able to select from multiple pre-filled office locations (for delivery) in addition to the option to have items shipped directly to a user-inputted address. 

How can I create this and have a shipping drop down that will show all their office locations and an option to add their own address?

[dropship_helps]

This app may helpful to you.  https://apps.shopify.com/multiship

[corporateshop]

Thank you, this is interesting. Unfortunately, this is for when you are taking one order of multiple items and drop shipping to multiple locations. I need every order to have pre-selected shipping options.