"Design" is the noun that refers to the process of creating a plan or specification for the construction of an object or system or for the implementation of an activity.

"Board" is the noun that refers to a flat, thin piece of wood or other stiff material, typically rectangular, used for various purposes, such as to build or repair structures, to make or hold objects, or to write or draw on.

"Section" is the noun that refers to a part or segment of a whole, especially of a document, book, or other text.

Therefore, "design section" refers to a part of a document or text that contains information about the design process or the design specification for an object, system, or activity.

Here are some examples of sentences using "design section" in Engpsh:

The design section of the proposal outpnes the specifications for the new office building. (这份提案的设计板块概述了新办公楼的规格。)
Can you please review the design section and provide feedback on the proposed layout? (请您审阅设计板块并对所提出的布局提供反馈好吗？)
The design section includes a detailed description of the materials and finishes to be used in the project. (设计板块包括本项目中使用的材料和表面处理的详细说明。)