Home tab→Assemble group→Component Structure Editor 
.
In the Virtual Components Structure Editor dialog box, specify the Model Type you want.
In the Name box, type the name you want, or select a name from the Name list.
Click the Add Virtual Component button or press Enter.
Tip:
As a best practice, you should choose between using Solid Edge Virtual Components and a workflow where Teamcenter empty items are created in a PDM client. Using both in a structure is not recommended.
If you need several occurrences of the same virtual component, press Enter repeatedly.
Use Promote Component and Demote Component to reorganize the assembly structure.
Use Delete to delete a virtual component.