The design process of a fiber bone two-fold umbrella typically involves the following steps:

1. Conceptualization: The designer defines the product specifications and goals, such as size, material, color, and features.

2. Research: The designer researches market trends, consumer preferences, and materials to inform the design.

3. Sketching: The designer creates rough sketches of the umbrella, exploring different shapes, sizes, and construction methods.
   

4. Prototyping: A physical prototype of the umbrella is created, either through manual construction or using computer-aided design (CAD) software.

5. Testing: The prototype is tested for functionality, such as ease of opening and closing, stability in wind, and waterproofness.

6. Refinement: Based on the results of testing, the designer makes revisions and improvements to the design.

7. Finalization: The final design is completed and the specifications for production are established.

Note: This is a general overview of the design process for a fiber bone two-fold umbrella and specific steps may vary depending on the designer, manufacturer, and product requirements.