With a modular structure, a firm . An example of the modular structure is the massive 787 Dreamliner project, in which Boeing contracted with many suppliers, each responsible for one component or assembly, which were then integrated to make the aircraft.

Assembles parts of the component which was provided by other contractors

Explanation:

With a modular structure, A firm contacted many supplies to produce or make a or some certain components of a product on the firm behalf, in which the firm would take further steps in assembling the components made by other supplies to produce or integrated to make a particular product, this was the case in regards to the massive 787 Dreamliner project.

A modular structure can be refers to a structure or product that can be group/detached or separated and later assembled to form a single product.