Depending on how your administrator has configured the EC Client , the product structure created by the Create Item / BOM command will be one of four types:
根据管理员如何配置EC Client ,通过创建项目／BOM命令创建的产品结构将会是如下四种类型的一种：
１．Linked Structure - 3D Only 链接结构 仅3D
The 3D CAD Model Document object (representing a CAD part or assembly ) is linked in the BOM beneath its corresponding Agile Part object . 三维CAD 模型文档对象是与与之对应的Agile 物料对象的BOM关联的
Someone browsing the BOM structure will not immediately see the 2D CAD Model Documents (representing a CAD drawing), they can be accessed through the Where Used tab of the 3D CAD Model Documents.
浏览BOM结构的人将不会立刻看到二维CAD模型文档 ，它们可以通过在哪里使用标签 的三维模型文档中访问。
2.Linked Structure - 2D & 3D 关联对象 2D & 3D
Both the 2D (representing a CAD drawing) and 3D CAD Model Document object ( representing a CAD part or assembly) are linked in the BOM beneath there corresponding Agile Part object .
无论是二维（表征工程图）和三维文档（表征CAD 零件或者装配体）对象都被链接在BOM 下面 与相应的Agile 物料对象
This can make browsing the data easier , although the BOM structure gets more cluttered .
这可以使浏览数据更简单，尽管BOM结构获取更加复杂
3. Unlinked Structure 非关联对象
The CAD Model Documents are not linked in the Part BOM at all .
CAD模型文档不与物料BOM关联。
Rather , there is an attribute on the Part objects that gives the Document number of the corresponding CAD Model .
不过，有一个物料对象的属性被提供，提供了相应CAD模型的文档编号.
Also there is an attribute on the Document giving the corresponding Part .
并且有一个文档对象属性提供相应的物料、组件。
This is not as convenient for navigation , but the Part BOM is much less cluttered .
这对导航来说不是很方便，不过减少了物料BOM 的复杂度。
4. Relationship linking 关系关联
The CAD Model Documents are linked in the Part BOM via Realationships .
CAD模型文档通过关系 与物料BOM进行关联
This allows the user to navigate to the Relationships tab to traverse over to the other structure .
这样允许用户通过关系标签来导航遍历其他对象结构
Note that this is supported in Agile 9.2.2 and later .
提示这个功能在Agile 9.2.2 以及之后的版本支持