The event category, event action, and event label are all independent descriptors of a single hit.
To get more "levels" of an event, for example:
Event Category Event Action Event Label Event Label 2 Event Label 3 Event Label 4 Event Label 5
You need to use custom sizes. Custom dimensions of the level of impact are in the same volume of the event, so any additional information that you send with this strike will be tied only to this single event.
For example, if you want to record the following event information:
Clicks> Click Clicks> Social Link Clicks> Facebook> Footer> Image Link
You will need to create 3 custom level sizes. You can send it as follows:
{ v: '1', tid: 'UA-XXXXX-1', cid: '55555', t: 'event', ec: 'Clicks', ea: 'Link Clicks', el: 'Social Link Clicks', ev: '30', cd1: 'Facebook', cd2: 'Footer', cd3: 'Image Link'}
Since all events are at the achievement level, you can create and reserve additional custom dimensions as additional levels of events and not worry about the values above each other's writing.
This means that you can send the following without problems:
Clicks> Link Links> Social Settings> Facebook> Body> CTA
{ v: '1', tid: 'UA-XXXXX-1', cid: '55555', t: 'event', ec: 'Clicks', ea: 'Signup Links', el: 'Social Options', ev: '30', cd1: 'Facebook', cd2: 'Body', cd3: 'CTA'}
A report can be generated to see which type of links click most (Event Action), and which social platform interacts with most (CD1) or where users click most (cd2).