Using Combine to Merge Solids and Surfaces
Use the Combine tool to merge solids and surfaces.
Select or press I.
Click the first solid or surface.
Ctrl+click additional solids or surfaces to merge them.
The model tree shows the merge.
Note: Ctrl+click the solids or surfaces you want to combine in the model tree, then click the
Combine tool to merge them.
Solids can be merged with solids, and surfaces with surfaces. Solids and surfaces can only be merged if the surfaces make a region that can be added to or cut out of the solid. For example, if you select the face of a cylinder, copy and paste it, then you can merge it with the solid used to create it.