Until May 20, 2013, Wall Worm did not natively handle entites. Until then, it only added Outputs for entities created with Convexity.
Now you can create entities natively with Wall Worm. There are three sets of tools: Point Entities, Brush Entities and an Entity Manager.
In order to use Entities with Wall Worm, you must have told Wall Worm where the FGD file for your mod is located in the global WW settings. Using the Preset Importer is the easiest way to get the correct FGD. But generally, you can find it in the Bin Directory for your mod. To get the full list of entities, make sure to pick the final FGD instead of a base or auxilliary FGD. For example choose the tf.fgd for Team Fortress or csgo.fgd for Counter-Strike: Global Offensive.
When Wall Worm first reads your FGD, it generates a cache file of all the rules for the entities so that the FGD doesn't need to be parsed each time you open WW. The first time you parse the FGD (or when reparsed), it may take several seconds (or minutes) for the action to complete.
To open the appropriate tool, click these items in the WW Menu:
- Wall Worm > Level Design > Brush Entities
- Wall Worm > Level Design > Entity Outputs
- Wall Worm > Level Design > Point Entities
Here are some reference cards until more documentation arrives: