You can add new component specific versions using "Add New" button on the right top of the Component Versions List screen.
You can define multiple component specific version at once. In above example "Android App" and "iOS App" are selected as component and "1.0.0" and "2.0.0" are selected as version. When you press the "Add" button, "Android App-1.0.0", "Android App-2.0.0", "iOS App-1.0.0" and "iOS App-2.0.0" will be created at once, a total of 4 component specific versions. This functionality is designed to allow easier operation, already existing component versions are simply ignored and does not halt whole operation. For example in the above case if we assume that "Android App-1.0.0" was already defined, in that case the plugin will simply create component versions for remaining cases and only report "Android-1.0.0" was already mapped.
Creating multiple component versions at once is especially helpful when you are installing the plugin on a JIRA instance where a lot of component and versions are already defined and you need to quickly specify which versions are valid for which component.