User Help > Managing Source Files as Members > Adding Dropped Members to a Project
  
Adding Dropped Members to a Project
CLI EQUIVALENT 
si addmemberfromarchive
Use the Add From Archive command to add a dropped member from an archive located on the server. You can also use this command to share the history of another member, where the source member can be located in another project from the added member.
The Add From Archive command:
can be deferred when performed from a Sandbox.
may be part of change package review (displayed as pending members in the project).
supports multiple selection of archives using the wizard.
To add members from archive in the GUI
Add Member(s) From Archive Options