You can use the Unite and Detach tools to group and ungroup meshes from different object. Detaching a group of meshes will result in freestanding meshes that can be modified independently, and they no longer behave like the original parametric object.

Unite

United meshes either create a new component or are added to an existing component that contains catalog information such as pricing, product info, and options. Perhaps you have copied the handles on a pedestal and added them to a lateral that you have edited. After making the modifications, you can create a unit of that lateral along with the handles.

To unite meshes, follow these steps:

1. Click the Make editable button and the click the components that you wish to modify. The components turn yellow (the main selected mesh will appear orange) and are now editable.
2. Make sure that the Single mesh select button is selected. The meshes will appear blue in Single mesh select mode. 
3. Open the Mesh dialog by clicking the button. Hold Ctrl to select the meshes in the Mesh dialog to unite. Selected meshes turn yellow with the main selected mesh turning orange.

4. Click the Unite button. The Group to dialog box opens. To keep the snap points and product information from the original object, select it from the list, or you can select New snapper. 

    

   Note: If you select New snapper, there will be no product or snapping information attached to the symbol.

    

5. Make your selection in the Group to dialog and click OK. The meshes have now been united according to your selection.
6. Update any information for the object by using Query from the right-click menu to Make Special and edit Part number, Part description, pricing, etc.
    

Detach

To break apart a combination of meshes, you need to use the Detach tool. This will result in freestanding meshes that can be modified.

To detach a unit, follow these steps:

1. Click the Make editable button and the click the components that you wish to modify. The components turn yellow (the main selected mesh will appear orange) and are now editable.
2. Make sure that the Single mesh select button is selected. The meshes will appear blue in Single mesh select mode. 
3. Open the Mesh dialog by clicking the button. Hold Ctrl to select the meshes in the Mesh dialog to unite. Selected meshes turn yellow with the main selected mesh turning orange.
4. Click the Detach button. Only the selected, detached mesh will remain selected.
5. Modify, delete, or move the detached mesh.