About Combining Nodes
You can combine top-level nodes on the Geometry and Topology Structure (GTS) Tree. To combine nodes, you must select two or more nodes on the GTS Tree, right-click, and click Combine on the shortcut menu or click 
Combine on the Structure tab. When you combine two or more nodes, Import DataDoctor creates a combine node and the selected nodes become sub-nodes or component nodes of the combine node.
Combine on the Structure tab. When you combine two or more nodes, Import DataDoctor creates a combine node and the selected nodes become sub-nodes or component nodes of the combine node.When the nodes selected to combine includes a body node, the resultant combine node retains the Solid option setting of the body node. However, when you select two body nodes to combine, a message prompts you that you cannot combine two body nodes. To combine the two nodes, you can right-click one of the body nodes and clear the Solid check box on the GTS Tree so that this node changes to a quilt node.
When you combine nodes, the ID of one body node is preserved. This node is then the target for Boolean operations in the part. If the target body node is a reference of a Boolean feature downstream of the import feature, the Boolean operation regenerates successfully after the Combine task. The only references to the consumed non-target nodes are lost.
The type of import feature and nodes selected determines the target node, based on the following conditions:
• If the nodes selected includes a body node, the body node is the target node.
• If the selection includes a quilt node and several top-level standalone surface nodes, the quilt node is the target node.
• If the selection consists of several quilt nodes, the first quilt node in the selection buffer is the target node. If the quilts were selected when the import feature was being redefined using the Add Bodies on the Import tab, and one of the quilts is owned by the foreign source file, this quilt node is the target node. If more than a single quilt from the selected quilts is owned by the import feature, the first quilt selected among these quilts owned by the source file is the target body.
• If all the selected nodes are top-level standalone surface nodes, the quilt of the first standalone top-level surface node in the selection is represented by the resulting combine node.
The combine node inherits the name of the target node. This name is a system-assigned generic name, the name of the node as read from the source file, or the name assigned by the user after import. The sub-node of the combine node that represents the original target node of the combine task retains the generic Component #### name. The remaining nodes retain their original names, whether read from the source file, assigned by the user after import, or the generic Component ####.
The target node also retains its Solid option setting even if the nodes selected for the combine task have different Solid option settings.