It is possible to create, edit and delete versions in WBS Gantt-Chart. However, only users with the following permissions can do this.

• System administrator
• Administrator
• Project administrator

Creating a version

To create from the contextual menu

1. Right-click on the project. 
2. Select Add ... ⇒  Version.

To create from the operations toolbar

1. Select the project row.
2. Select Add  ⇒ Version on the toolbar.

The name of the created version is "Version of project name".
Also, the start date / release date is set as the date of creation (when the initial planned date in the issue configuration is set as the date of creation).

Editing a version

You can edit the name, start date and release date (finish date) of versions on the WBS display. To edit a version, double-click the item in the WBS display, or drag the Gantt bar. 

Deleting a version

As with creating a version, you can delete a version from the contextual menu or from the operations toolbar.

To delete from the contextual menu

1. Right-click the version.
2. Select Delete.

To delete from the operations toolbar

1. Select the version row.
2. Select Delete ⇒ Version on the toolbar.